Chapter 8: Q.42 (page 479)
Explain in complete sentences what the confidence interval means.
A confidence interval is a kind of interval estimate of a population parameter
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The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12, beginning ice-skating class was picked. In that class were 64 girls and 16 boys. Suppose that we are interested in the true proportion of girls, ages 8 to 12, in all beginning ice-skating classes at the Ice Chalet. Assume that the children in the selected class are a random sample of the population.
Calculate the following:
a. x = _______
b. n = _______
c. p′ = _______
Suppose the marketing company did do a survey. They randomly surveyed households and found that in of them, the woman made the majority of the purchasing decisions. We are interested in the population proportion of households where women make the majority of the purchasing decisions.
Identify the following:
a. ______
b. ______
c. ______
List two difficulties the company might have in obtaining random results, if this survey were done by email.
Define the random variable X in words.
In words, define the random variables and .
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