Chapter 10: Q.129 (page 610)
According to a YWCA Rape Crisis Center newsletter, of rape victims know their attackers. A study is done to verify this.
The given statement is a single proportion.
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
Use the following information to answer the next five exercises. The mean speeds of fastball pitches from two different
baseball pitchers are to be compared. A sample of 14 fastball pitches is measured from each pitcher. The populations have
normal distributions. Table 10.18 shows the result. Scouters believe that Rodriguez pitches a speedier fastball.
State the null and alternative hypotheses.
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
Use the following information to answer the next five exercises. Two metal alloys are being considered as material for ball bearings. The mean melting point of the two alloys is to be compared. 15 pieces of each metal are being tested. Both populations have normal distributions. The following table is the result. It is believed that Alloy Zeta has a different melting point.
Is this a right-, left-, or two-tailed test?
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 is the p-value?
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.
Calculate the test statistic.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
