This module provides an overview of Hypothesis Testing of Single Mean and Single Proportion as a part of Collaborative Statistics collection (col10522) by Barbara Illowsky and Susan Dean.
Rebecca and Matt are 14 year old twins. Matt’s height is 2 standard deviations below the mean for 14 year old boys’ height. Rebecca’s height is 0.10 standard deviations above the mean for 14 year old girls’ height. Interpret this.
Matt is 2.1 inches shorter than Rebecca
Rebecca is very tall compared to other 14 year old girls.
The next three exercises refer to the following information: Ninety homeowners were asked the number of estimates they obtained before having their homes fumigated.
= the number of estimates.
Rel. Freq.
Cumulative Rel. Freq.
1
0.3
2
0.2
4
0.4
5
0.1
Complete the cumulative relative frequency column.
Calculate the sample mean (a), the sample standard deviation (b) and the percent of the estimates that fall at or below 4 (c).
Lee bakes pies for a small restaurant in Felton, CA. She generally bakes 20 pies in a day, on the average. Of interest is the num.ber of pies she bakes each day
Define the Random Variable
.
State the distribution for
.
Find the probability that Lee bakes more than 25 pies in any given day.
Six different brands of Italian salad dressing were randomly selected at a supermarket. The grams of fat per serving are 7, 7, 9, 6, 8, 5. Assume that the underlying distribution is normal. Calculate a 95% confidence interval for the population mean grams of fat per serving of Italian salad dressing sold in supermarkets.