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Ch 10.1 HT Practice Name:

To study the long-term effects of preschool programs for poor children, researchers designed an experiment. They recruited 123 children who had never attended preschool form low-income families in Michigan. Researchers randomly assigned 62 of the children to attend preschool (free of charge) and the other 61 served as the control group and continued to not attend preschool. One response variable that was looked at was the need for social service as adults. In the past 10 years, 38 of the children in the preschool group and 49 of the children in the control group have needed social services.

1) Does this survey provide convincing evidence that preschool reduces the later need for social services? Carry out a hypothesis test to support your answer.

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Ch 10.1 HT Practice Name:

To study the long-term effects of preschool programs for poor children, researchers designed an experiment. They recruited 123 children who had never attended preschool form low-income families in Michigan. Researchers randomly assigned 62 of the children to attend preschool (free of charge) and the other 61 served as the control group and continued to not attend preschool. One response variable that was looked at was the need for social service as adults. In the past 10 years, 38 of the children in the preschool group and 49 of the children in the control group have needed social services.

1) Does this survey provide convincing evidence that preschool reduces the later need for social services? Carry out a hypothesis test to support your answer.

2) The Minitab output to the right gives a

95% confidence interval for p1 – p2.

Interpret the interval in context. Then

explain what additional information the

confidence interval provides.

2) The Minitab output to the right gives a

95% confidence interval for p1 – p2.

Interpret the interval in context. Then

explain what additional information the

confidence interval provides.

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