JustAnswer
|1) Classifying the fruit in a basket as apple, orange, or banana, is an example of the ___________ level of measurement. |
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|[pic]D. |
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|nominal |
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|2) Which of the following best defines the relationship between confounding, dependent, and independent variables? |
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|[pic]B. |
|[pic] |
|The confounding variable influences the dependent variable, but is not separated from the independent variable. |
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|3) If a researcher manipulates one of the variables and tries to determine how the manipulation influences other variables, the researcher is|
|conducting a(n) |
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|[pic]B. |
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|experimental study. |
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|4) In an ungrouped frequency distribution of the average age of high school graduates, what would be the boundaries for the class of |
|graduates who were reported to be 18 years old? |
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|[pic]B. |
|[pic] |
|17.5–18.5 years old |
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|5) For the class 10 – 18, the upper class limit is |
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|[pic]A. |
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|18.5 |
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|6) What are the boundaries of the class 12-19? |
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|[pic]D. |
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|11.5 and 19.5 |
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|7) An automobile dealer wants to construct a pie graph to represent types of cars sold in July. He sold 72 cars, 16 of which were |
|convertibles. How many degrees should be used for the convertibles section? |
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|[pic]B. |
|[pic] |
|80° |
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|8) A television station interviews five movie viewers after the first showing of a movie. After finding out that all five enjoyed the movie |
|very much, the reporter states that this movie will definitely be a big hit. This is an example of ____________________. |
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|[pic]C. |
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|suspect samples |
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|9) Karen is constructing a pie graph to represent the number of hours her classmates do homework each day. She found that 8 of 24 classmates |
|did homework for 3 hours each day. In her pie graph, this would represent how many degrees? |
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|[pic]C. |
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|120° |
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|10) An advertisement for a motorcycle states that it is 15% more powerful. This is an example of _________________. |
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|[pic]A. |
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|detached statistics |
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|11) A pie graph is NOT useful in showing which of the following characteristics of a data set? |
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|[pic]D. |
|[pic] |
|Frequency changes over time |
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|12) In an advertisement for a car, a driver is shown driving expertly through a difficult road course. At the bottom of the ad, the following|
|is included in small print "Professional driver on a closed course." Which of the following choices best describes this misuse of data? |
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|[pic]B. |
|[pic] |
|Implied connections |
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|13) Find the mean of the following data set: 9, 4, 7, 2, 13 |
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|[pic]C. |
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|7.0 |
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|14) Which of the following is the properly rounded mean for the given data? 7, 8, 13, 9, 10, 11 |
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|[pic]D. |
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|9.7 |
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|15) Find the mode for the following data: 5, 4, 3, 4, 5, 6, 5, 5, 3, 4 |
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|[pic]C. |
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|5 |
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|16) Given that the variance for a data set is 1.20, what is the standard deviation? |
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|[pic]B. |
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|1.10 |
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|17) The grades for the trigonometry exam are listed below. Find the range. 85, 76, 93, 82, 84, 90, 75 |
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|[pic]A. |
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|18 |
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|18) Find the range of the set of values 6, 15, 3, 10, and 5. |
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|[pic]B. |
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|12 |
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|19) A gumball machine contains 300 grape-flavored balls, 400 cherry-flavored balls, and 500 lemon-flavored balls. What is the probability of |
|getting 1 grape ball, 1 cherry ball, and 1 lemon ball if each ball was removed and then replaced before choosing the next from the machine? |
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|[pic]C. |
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|0.0347 |
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|20) If one card is drawn from an ordinary deck of cards, what is the probability that the card will be an ace, a king of hearts, or a spade? |
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|[pic]C. |
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|17/52 |
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|21) Four statistics professors and six chemistry professors are available to be advisors to a student organization. The student organization |
|needs two of the professors to be advisors. If each professor has an equal chance of being selected, what is the probability that both |
|professors are chemistry professors? |
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|[pic]D. |
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|0.333 |
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|22) The statement, "The probability that a certain sports team will win its next game is about 60%," is an example of |
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|[pic]C. |
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|subjective probability. |
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|23) What is the set of all possible outcomes of a probability experiment? |
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|[pic]D. |
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|The sample space |
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|24) What type of probability uses a knowledge of sample spaces as opposed to experiments to determine the numerical probability that an event|
|will occur? |
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|[pic]B. |
|[pic] |
|Classical probability |
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|25) Which of the following properties distinguishes the standard normal distribution from other normal distributions? |
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|[pic]B. |
|[pic] |
|The mean is 0 and the standard deviation is 1. |
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|26) Find the area under the standard normal distribution curve between z = 0 and z = -2.16. |
|[pic] |
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|[pic]C. |
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|0.4846 |
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|27) The number of standard deviations a particular X value is from the mean is commonly referred to as ________. |
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|[pic]B. |
|[pic] |
|z |
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|28) For a normal distribution curve with a mean of 21 and a standard deviation of 5, which range of the variable defines an area under the |
|curve corresponding to a probability of approximately 68%? |
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|[pic]A. |
|[pic] |
|From 16 to 26 |
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|29) If a normal distribution has a mean of 20 and a standard deviation of 10, then |
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|[pic]D. |
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|the median is 20 and the mode is 20. |
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|30) On an easy test, the mean score was 96 out of a possible 100 points. The distribution of the test scores is likely to be |
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|[pic]A. |
|[pic] |
|negatively skewed. |
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|31) Sampling techniques are often used |
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|[pic]D. |
|[pic] |
|when the population is too large to be analyzed. |
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|32) If all possible samples of a specific size have the same chance of being selected, what type of sampling is being used? |
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|[pic]D. |
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|Random sampling |
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|33) Which of the following methods will give a truly random sampling of the general population? |
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|[pic]A. |
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|Identify all the members of the population, and then select the desired number randomly from among them. |
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|34) A pollster wanted to determine how much support a new library tax would have in a major metropolitan area. The metro area is divided into|
|regions, Southeast, Southwest, Northeast, Northwest, and Central, and 100 voters in each region are surveyed. What type of sampling technique|
|is being employed? |
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|[pic]B. |
|[pic] |
|Stratified sampling |
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|35) A small-town politician is running for the district council seat. If the politician decides to poll three blocks in the district to |
|determine his chance of winning the seat, what type of sampling is being used? |
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|[pic]D. |
|[pic] |
|Cluster sampling |
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|36) A statistics teacher taught Introductory Statistics to a large lecture class of 200 students. She wanted to estimate the average on the |
|first examination by selecting every eighth student's test score and finding the average of these scores. What type of sampling technique is |
|being employed? |
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|[pic]A. |
|[pic] |
|Systematic sampling |
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