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A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes used per day. The results of the sample included a sample mean of 34.5 minutes and a sample standard deviation equal to 11.5 minutes. Based on this information, and using a 95 percent confidence level: what is the critical value?
At the 0.05 level of significance, is there evidence that the proportion of incorrect reimbursements in the population was greater than 0.10? Discuss the underlying assumptions of the test used in (a)
In a standard test for reaction time, female candidates for flight school are found to have times that are normally distributed with a mean of 0.65 seconds and a standard deviation of 0.15 seconds.
A study of 100 sedentary people in this age group is planned to test whether they have a higher or lower level of plasma glucose then the general population.
On a December day, the probability of snow is .30. The probability of a "cold" day is .50. The probability of snow and "cold" weather is .15. Are snow and "cold" weather independent events?
If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significance level that the claim is true.
question the manager of the toledo mudhens decides to see whether batting practice think of this as the equivalent a
Assume that 60 percent of the voters in a particular region support a candidate. Find the probability that a sample of 1,000 voters will yield a sample proportion in favor of the candidate within 4 percentage points of the actual proportion.
1.from previous polls it is believed that 66 of likely voters prefer the incumbent. a new poll of 500 likely voters
two methods of memorizing difficult material are being tested to determine if one method produces better retention.
without an automated irrigation system the height of plants two weeks after germination is normally distributed with a
An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are:
Patient's heart attack as mild, moderate or severe. The nurse's classification of the severity of the patient's heart attack is an example of what type of variable?
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