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A national study has determined that people who work full time average 43.4 hours worked per week. Assume that the number of house worked per week for those who work full time is normally distributed. Suppose 12% of these workers more than 48 hours. Based on this perecentage, what is the standard deviation of number of hours worked per week for those workers?
Compute a 95% confidence level for the difference in the means of the two treatment methods and select the best answer below. Assume that the independent random samples were taken from normal distribution.
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
The Money & Investing section of The Wall Street Journal contains a summary of daily investment performance for stock exchanges, overseas markets, options, commodities, futures, and so on.
A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6. A raw score of 47 is associated with what percentile?
How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level. Complete an ANOVA table. State your decision regarding the null hypothesis.
Using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 7.3? Explain.
A sample from a population with μ = 40 and =σ10 has a mean of m = 44. if the sample mean corresponds to a z = 2.00, then how many scores are in the sample?
Based on the Nielsen ratings, the local CBS affiliate claims its 11 p.m. newscast reaches 41% of the viewing audience in the area. In a survey of 100 viewers, 36% indicated that they watch the late evening news on this local CBS station. What is t..
Suppose it has been determined that the average number of customers waiting for service is 1.929. There are two servers. Determine:
What is the probability that a student who has failed the test came from the South District?
What should the cut-off score be for the interviews? (Round to nearest whole number).
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