Chapter 10: Q. 44 (page 598)
What is the p-value?
we need to find the value of test statistics
Given graph and
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According to a television commercial, of dentists agree that Ultrafresh toothpaste is the best on the market.
Indicate if the hypothesis test is for :-
a. independent group means, population standard deviations, and/or variances known
b. independent group means, population standard deviations, and/or variances unknown
c. matched or paired samples
d. single mean
e. two proportions
f. single proportion
A study is done to determine if Company A retains its workers longer than Company B. Company A samples workers, and their average time with the company is five years with a standard deviation of Company B samples workers, and their average time with the company is with a standard deviation of The populations are normally distributed.
a. Are the population standard deviations known?
b. Conduct an appropriate hypothesis test. At the significance level, what is your conclusion?
What is the p-value?
The mean number of English courses taken in a two–year time period by male and female college students is believed
to be about the same. An experiment is conducted and data are collected from 29 males and 16 females. The males took an
average of three English courses with a standard deviation of 0.8. The females took an average of four English courses with
a standard deviation of 1.0. Are the means statistically the same?
Use the following information to answer the next twelve exercises.In the recent Census, three percent of the U.S. population reported being of two or more races. However, the percent varies tremendously from state to state. Suppose that two random surveys are conducted. In the first random survey, out of 1,000 North Dakotans, only nine people reported being of two or more races. In the second random survey, out of 500 Nevadans, 17 people reported being of two or more races. Conduct a hypothesis test to determine if the population percents are the same for the two states or if the percent for Nevada is statistically higher than for North Dakota.
What is the random variable of interest for this test?
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