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Question: An independent golf equipment testing facility compared the difference in the performance of golf balls hit off a regular 2-3/4 ′′ wooden tee to those hit off a 3′′ Stinger Competition golf tee. A Callaway Great Big Bertha driver with 10 degrees of loft was used for the test, and a robot swung the club head at approximately 95 miles per hour. Data on total distance traveled (in yards) with each type of tee, based on the test results, are provided on the WeissStats CD.
a. Obtain normal probability plots, boxplots, and the standard deviations for the two samples.
b. At the 1% significance level, do the data provide sufficient ev- idence to conclude that, on average, the Stinger tee improves total distance traveled?
c. Find a 99% confidence interval for the difference between the mean total distance traveled with the regular and Stinger tees.
d. Are your procedures in parts (b) and (c) justified? Why or why not?
Discovering that 12 will return to summer school. Construct a 90% confidence interval estimate for the fraction of current spring students who will return to summer school.
AJ DAVIS is a department store chain, which has many credit customers and wants to find out more information about these customers. A sample of 50 credit customers is selected with data collected on the following five variables:
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
If 8 patients participate in this study (so that n left arms and n left arms are measured), how many degrees of freedom should the researcher use in her t-test critical value?
Compute the test statistic. Using = 0.05, perform the test using either the critical value approach or the p-value approach. What is your conclusion?
Find out point estimate and 95% confidence interval for mean family dental expenses of all employees of company.
The average demand for carpet from the stores that purchase from the distributor is 4500 yards per month, with a standard deviation of 900 yards. what is the probability that a customer's order will not be met during a month?
Does the data prove a significant difference in mean times?
Assuming that the population variances are equal for male and female Grade Point Averages (GPAs), use the following sample data to test whether the averages are different at the 0.05 level of significance.
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval? What percentage of times will the mean, or population proportion, not be found within the confidence ..
In a graduating class of 753 high school seniors, what is the probability that 15 or more will live beyond their 90th birthday?
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