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Find the margin of error for the 95% confidence interval used to estimate the population proportion. In a survey of 7100 T.V. viewers, 40% said they watch the network news programs.
What is the average time that catalog customers must wait before their calls are transferred to the order clerk? (b) What is the average number of callers waiting to place an order?
It is believed that population standard deviation is 15 days. If test is conducted using 0.05 level of significance, what conclusion must be reached?
Within distribution of scores, measures of dispersion give an indication of?
Suppose a sample of 35 surveys shows a sample mean of 17 minutes. Use = 4 minutes. Is the premium rate justified? Formulate the null and alternative hypotheses for this application.
True mean chloride level of all healthy Washington residents. What is the lower limit of the 90% confidence interval? what is the upper limit of the 90% confidence interval?
A study report in Journal of Small Business Management (1977) concluded that self-employed individuals experience higher job stress than individuals who are not self employed.
Assume that the lives of all such bulb (approximately) normally distribution. Make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
Find a 99% confidence interval for the population mean number of weekly miles.
Suppose an unfair coin comes up tails 42% of the time if it is flipped. If the coin is flipped 13 times, what is the probability that?
Would Kruskal-Wallis be the suitable statistical procedure to test this Research Question (RQ)? Describe your answer. When would you use Chi-Square test rather than One-Way Anova?
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