JustAnswer
1. An estimator is called consistent if its variance and standard deviations consistently remain the same regardless of changes in the sample size.
True
False
2. When determining the sample size n, if the value found for n is 79.2, we would choose to sample 79 observations.
True
False
3. The larger the p-value, the more the chance of rejecting the null hypothesis.
True
False
4. A fastener manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of ¼ inch bolts it manufactures is distributed according to a normal distribution. If we reject the null hypothesis, it is reasonable to assume that the population distribution is at least approximately normally distributed.
True
False
5. The chi-square distribution is a continuous probability distribution that is skewed to the left.
True
False
6. The error term in the regression model describes the effects of all factors other than the independent variables on y (response variable).
True
False
7. When constructing a confidence interval for a sample proportion, the t distribution is always appropriate if the sample size is small.
True
False
8. When the level of confidence and sample standard deviation remain the same, a confidence interval for a population mean based on a sample of n=100 will be narrower than a confidence interval for a population mean based on a sample of n=50.
True
False
9. The sampling distribution of the sample mean is always normally distributed according to the Central Limit Theorem.
True
False
10. The error term is the difference between the observed value of the dependent variable and the predicted value of the dependent variable.
True
False
11. We do not need to perform the continuity correction if the population is 20 times or more than the sample size.
True
False
12. For a continuous distribution, Probability of (X greater than or equal to 10) is less than the probability of (X greater 10)
True
False
13. In a regression model the population of potential error terms is assumed to have a t-distribution.
True
False
14. The least squares simple linear regression line minimizes the sum squares of the vertical deviations between the line and the data points.
(Points : 8)
True
False
15. In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
True
False
16. To investigate the rate at which employees with cancer are fired or laid off, a telephone survey was taken of 100 cancer survivors who worked while undergoing treatment. Seven (7) were either fired or laid off due to their illness. Construct a 90% confidence interval for the true percentage of all cancer patients who are fired or laid off due to their illness.
[0.0000 0.2034]
[0.0371 0.1029]
[0.0039 0.1361]
[0.0078 0.1400]
[0.0278 0.1122]
17. The area under the normal curve between z=2 and z=3 is ________________ the area under the normal curve between z=1 and z=2.
Greater than
Less than
Equal to
Answers 1, 2, or 3 depending on the value of the Mean
Answers 1, 2, or 3 depending on the value of the Standard Deviation
18. For a given multiple regression model with three independent variables, the value of the adjusted multiple coefficient of determination is _________ less than R .
Always
Sometimes
Never
Can be greater or less depending on the standard error
19. A new company is in the process of evaluating its customer service. The company offers two types of sales: 1. Internet sales; 2. Store sales. The marketing research manager believes that the Internet sales are more than 10% higher than store sales. The null hypothesis would be:
Pinternet-Pstore>.10
Pinternet-Pstore=.10
Pinternet-Pstore ................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.