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Senior management of a consulting services firm is concerned about a growing decline in the firm's weekly number of billable hours. The firm expects each professional employee to spend at least 40 hours per week on work. In an effort to understand this problem better, management would like to estimate the standard deviation of the number of hours their employees spend on work-related activities in a typical week. Rather than reviewing the records of all the firm's full-time employees, the management randomly selected a sample of size 50 from the available frame. The sample mean and sample standard deviations were 46.4 and 7.2 hours, respectively.
Construct a 97% confidence interval for the average of the number of hours this firm's employees spend on work-related activities in a typical week.
Jacquemyn et al. (A-21) conducted a survey among gynecologists-obstetricians in the Flanders region and obtained 295 responses.
For a normal distribution with mean of 80 and a standard deviation of 8, find the number of standard deviations the raw score 67 is from the mean
For 1989 and 1990 Dave Johnson had the highest decathlon score in the world. When Johnson reached a speed of 32 ft/sec on the pole vault runway, his height above the ground t seconds after leaving the ground was given by h= -16t^2+32t.
a. Assume that Bangor Co. (a U.S. firm) knows that it will have cash inflows of $900,000 from domestic operations, cash inflows of 200,000 Swiss francs due to exports to Swiss operations, and cash outflows of 500,000 Swiss francs at the end ..
Alcohol and carbohydrates in beer revisited. Refer to the previous exercise. The data that you used to compute the correlation includes an outlier.
Modern ice creams are not simple recipes. Many use some type of gum to enhance texture, and a non-cream protein source (for example, whey protein solids). A food scientist is trying to determine how types of gum and protein added change a sensory ..
Use a statistical computer package to verify the rank-sum and the Z-statistic obtained in Exercise 20. Is the p-value the same? (Does the statistical package use a continuity correction?)
a researcher is interested in the effect of st. johns wort on memory. a group of 25 college students is selected to
Is there any evidence to suggest that the true mean weight of passengers and gear is greater than 496 pounds? Use a = 0.01.
a study of cats and dogs found that 25 of 45 cats and 44 of 60 dogs slept more than 10 hours per day. at the .05 level
Suppose that in a random simulation of 100 trades using this system, the trading rule beat the market only 61 times. Conduct the test at the 0.05 level of significance.
What is the probability that Ontario is not selected? What events did you need to consider when you answered parts (c) and (d) of this exercise
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