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Dr. Susan Benner is an industrial psychologist and is currently studying stress in the executives of Internet companies, for which she developed a questionnaire that she believes measures stress. A result of 80 indicates a dangerous level of stress. A sample of 15 executives revealed an average stress level of 89.47 with a standard deviation of 8.08. Calculate a 95% confidence interval to estimate the population mean.
In an experiment designed to measure the time required for an inspector's eyes to become accustomed to the reduced amount of light needed for a penetrating inspection, the average sample time for n = 9 inspectors was 6.32 seconds and the sample standard deviation was 1.65. seconds. Prior to the experiment, it was assumed that the average adaptation time was at least 7 seconds. Assuming that the adaptation time has a normal distribution, what is the conclusion of the hypothesis test? Consider a significance level of 0.05.
A scatter diagram includes the data points (x = 3, y = 8), (x = 5, y = 18), (x = 7, y = 30), and (x = 9, y = 32).- Using the leastsquares criterion, which of these regression lines is the better fit to the data? Why?
from their 50 data points washington dc not in the study the researchers calculated a correlation of 0.988. based on
Immigration (optional). In the setting of Exercise, what is the probability of getting a sample in which more than 51% of those sampled think that the level.
Do the P-values add any useful information beyond that conveyed by the statement that both results are statistically significant? Write a short paragraph explaining your views on this question.
a. The probability is 0.68 that sample proportion falls between what two values?
At the 0.05 level in a one-tail test, is this sample finding significantly lower than the 49% reported by Opinion Research? Determine and interpret the p-value for the test.
the average hourly wage of workers at a fast food restaurant is 6.50hr with a standard deviation of 0.45. assume that
Design an experiment to test the hypothesis that single-gender math classes are beneficial to adolescent females. Construct operational definitions of both the independent and dependent variables.
Multiple averaging methods have been used to forecast weekly demand using 1 year's worth of weekly actual demand data.
a group of researchers studied the effect of global environmental change on grazing lands. their article reported the
The Delphi method solicits input from customers or potential customers regarding their future purchasing plans.
A jar contains twenty marbles, eight red, eight blue and four green. The probability of drawing a blue marble is twice that of drawing a green.
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