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The mean length of a work week for the population of workers was reported to be 39.2 hours. Suppose that we would like to take a current sample of workers to see whether the mean length of a work week has changed from the previously reported 39.2 hours.
A. State the hypotheses that will help us determine whether a change occurred in the mean length of a work week.
B. Suppose a current sample of 112 workers provided a sample mean of 38.5 hours. Use a population standard deviation = 4.8 hours. What is the p-value?
C. At a = .05 can the null hypothesis be rejected? What is your conclusion?
D. Repeat the preceding hypothesis test using the critical value approach.
Mean of $32,000 and a standad deviation of $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
To find z-score and required probabilities based on Normal distribution. Assume that childrens weekly allowances are normally distributed in the population.
What is the smallest number of consumers that Timex can survey to guarantee a margin of error of .05 or less at a 99% confidence level and calculate the intervals correctly
Rrequired service under the warranty. consider a new dealer. what is the probablity that the first claim under this warranty is the tenth car sold?
hen investigating a relationship between birth weight and IQ, researchers found that 258 subjects with extremely low birth weights (less than 1000 g) had Wechsler IQ scores at age 8 with a mean of 95.5 and a standard deviation of 16.0.
The fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At α = .01, did the yellow fire trucks have a significantly lower accident rate?
A fast-food restaurant sells hamburgers and chicken sandwiches. On a typical weekday, the demand for hamburgers is normally distributed with a mean 313 and a standard deviation 57; the demand for chicken sandwiches is normally distributed with a m..
Use a two proportion z-test to perform the required hypothesis test. State the conclusion.
A study of 36 members of the Central Park Walkers showed that they could walk at an average rate of 2.6 miles per hour. The sample standard deviation is 0.4. Find the 95% confidence interval for the mean for all walkers.
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
Sketch the appropriate distribution, and locate the critical region for a = 0.05.
Generate a testable null statistical hypothesis and an alternative statistical hypothesis. Select an alpha level of .05, .01, or .001 and justify your choice.
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