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The personnel manager of a large retail clothing store suspects a difference in the mean amount of break time taken by workers during the weekday shifts compared to that of the weekend shifts. It is suspected that the weekday workers take longer breaks on the average. A random sample of 46 weekday workers had a sample mean of 53 minutes . A random sample of 40 weekend workers had a mean of 47 minutes. Previous studies show that the weekday workers had a standard deviation of 7.3 minutes and a standard deviation of 9.1 minutes. Test the manager's suspicion at the 5% level of significance. Find the P-value or an interval containing the P-value for the sample test statistic.
Determination of statistical significance can only be determined by calculating the exact p value and declaring results as significant. True or false?
Clearly identify the independent and dependent variables you would study. Determine whether a one-tail or two-tail test is most appropriate and explain why. Generate a testable null statistical hypothesis and an alternative statistical hypothesis.
Assuming that students make their decisions independently, the number who accept has the B (1200, 0.75) distribution. If this number is less than 950, the college will admit students from its waiting list.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
Once production is set up, 80 units can be produced per day. Daily demand rate for the units is 60 per day. a. What is the most economical number to produce per production run? b. How long is each production cycle?
Why are estimations and confidence intervals important? Do confidence intervals and estimation play a role in the selection of sample size?
What is the probability that he completed the assignments?
Compute the within group variability. Do you require any post hoc testing? Why or why not? Decribe in detail.
Obtain a test statistic and p -value. Interpret the results at α = .01.
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
Of those customers using extra unleaded or premium gas, 60% fill their tanks. What is the probability that the next customer fills the tank?
A marketing survey is conducting in which students are to taste two different brands of soft drink. Their task is to currently identify the brand tasted.
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