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Chapter 10: Q. 70 (page 600)
What are the sample mean difference?
difference
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It is believed that of males pass their drivers test in the first attempt, while of females pass the test in the first attempt. Of interest is whether the proportions are in fact equal.
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
Two types of valves are being tested to determine if there is a difference in pressure tolerances. Fifteen out of a random sample of of Valve cracked under Six out of a random sample of of Valve cracked under Test at a level of significance.
Use the following information to answer next five exercises. A study was conducted to test the effectiveness of a juggling class. Before the class started, six subjects juggled as many balls as they could at once. After the class, the same six subjects juggled as many balls as they could. The differences in the number of balls are calculated. The differences have a normal distribution. Test at the significance level.
What conclusion can you draw about the juggling class?
A golf instructor is interested in determining if her new technique for improving players鈥� golf scores is effective. She takes four (4) new students. She records their -hole scores before learning the technique and then after having taken her class. She conducts a hypothesis test. The data are as Table 10.37.
This is:
a. a test of two independent means.
b. a test of two proportions.
c. a test of a single mean.
d. a test of a single proportion.
Use the following information to answer the next five exercises. A study was conducted to test the effectiveness of a software patch in reducing system failures over a six-month period. Results for randomly selected installations are shown in Table 10.21. The 鈥渂efore鈥� value is matched to an 鈥渁fter鈥� value, and the differences are calculated. The differences have a normal distribution. Test at the 1% significance level.
What is the p-value?
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