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A random sample of 160 car purchases are selected and categorized by age. The results are listed below. The age distribution of drivers for the given categories is 18% for the under 26 group, 39% for the group, 31% for the 45-65 group, and 12% for the group over 65. Find the critical value to test the claim that all ages have purchase rates proportional to their driving rates.
The manufacturer of hardness testing equipment uses steel-ball indenters to penetrate metal that is being tested. However, the manufacturer thinks it would be better to use a diamond indenter so that all types of metal can be tested. Because of diffe..
Be sure to specifically identify the statistical formulas and what additional data you would need to determine your estimate(s).
The sample average is $97, and the SD is $17. Assume that the repair cost has a normal curve. What is the null hypothesis?
A company selects five of the machines at random, thinking all are in working condition. What is the probability that all five of the machines are nondefective?
If the random sample of 16 men does result in a mean score of 590 is there strong evidence to support the claim that the course is actually effective? why or why not?
Find the sample mean and sample standard deviation of the amount citizens spend per year. When finding a confidence interval for the true mean spent of ALL citizens, should we use a z-score or a t-score? Why?
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
a. Solve using the p value approch. b. Solve using the classical approch.
A researcher wishes to forcast the proportion of fish in a perticular lake which is inedible due to pollution of the lake.
In order that the sample proportion and the population proportion not differ by more than 0.05 with 95% level of confidence, what sample size should be used?
In patients with congestive heart failure, two or more drugs were prescribed in 257 of 437 U.S. patients. In Scotland, 39 of 179 patients had two or more drugs prescribed
Mattel Corporation produces a remote-controlled car that requires three AA batteries. The mean life of these batteries in this product is 35 hours with a standard deviation of 5.5 hours. As part of its testing program Sony tests samples of 16 batt..
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