Estimate µ with 95% confidence
.A random sample of 50 was drawn from a population. The sample mean and standard deviation are = 530 and s = 125. Estimate μ with 95% confidence.
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If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
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.A statistic practitioner randomly sampled 1,500 observations and found = 14 and s = 22. Test to determine whether there is enough evidence at the 5% significance level to infer that the population mean is less than 15.
Researchers who study the possible causes of gender identity disorder have noted that many girls who exhibit "tomboyish" behavior were exposed to __________ during fetal development.
Mall security estimates that the average daily per-store theft is exactly $200, but wants to determine the accuracy of this statistic. The company researcher takes a sample of 81 clerks and finds that =$180 and s = $40.
Which is more appropriate-to view language as a subset of communication or to view communication as a subset of language?
If an executive submits an expense of $720 for a one-day stay in Moscow, should this expense be considered unusually high? Why or why not?
The sample mean was calculated as = 5,064 hours. If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significant level that the claim is true?
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