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QUESTION: A company union claims that the mean number of hours all employees work per week is more than 45. From a sample of 32 employees, the mean number of hours worked per week was 48 and the standard deviation was 10.8 hours. Assume the population is normally distributed. At ???? = .01, is there enough evidence to support the union's claim?
QUESTION: The population of all verbal GRE scores are known to have a standard deviation of 8.5. The PSU Psychology department claims its applicants have an verbal GRE scores of 210. This year, the mean verbal GRE scores for the 42 applicants was 212.79. Using a value of α = 0.05 is there evidence that the mean verbal GRE score is not 210?
a marketing survey involves product recognition in new york and california. of 558 new yorkers surveyed 193 knew the
Test the hypothesis that implementation of the OSHA program has reduced the mean employee lost time. Use a level of significance of 0.10.
A veterinarian collects data on the number of times race horses are raced during their career. The researcher finds the average number of races a horse enters is = 15.3 with a standard deviation of s = 6.8 in a sample of n = 20 horses. The standard e..
The president of the wholesale distributor is concerned about the possibility of stockouts causing a loss of customer confidence and loyalty and is interested in maintaining safety stock in inventory to prevent potential stockouts.
the mean and the standard deviation of the sample of 100 bank customer waiting times in table 1.8 are xbar5.49 and
A basketball player has made 80% of his foul shots during the season. Assuming the shots are independent, find the probability that in tonight s game he
The mean of major student taking the GRE test in 2010 was 1000 with a standard deviation of 230. if you select a random sample of 75 students, what is the probabbility that the mean score is below 950?
Significant? Public health officials believe that 90% of children have been vaccinated against measles. A random survey of medical records at many schools.
Information collected from a random sample of 25 fraternity members, however, reveals a mean of 12.34 hours per week with a standard deviation
An experimental drug is administered to 30 randomly selected indivduals, with the number of individuals responding favorably recorded. Does this represent a binomial experiment.
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
Construct box and whisker plots for the time required to complete the two types of calls and briefly discuss.
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