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A woman wrote to DearAbby and claimed that she gave birth 308 days after a visit from her husband, who is in the Navy. Lengths of pregnancies have a mean of 268 days and a standard deviation of 15 days. Determine if such a length is considered unusual?
Determine the confidence level used for the given confidence interval.
A box in a certain supply room contains four 40 w light bulbs, five 60-W bulbs, and six 75-W bulbs. If two are randomly selected from the box and at least one of them is found to be rated 75-W.what is the probability that both of them are 40- W bu..
Using a .05 level of significance, test whether the sample results indicate that the manufacturing process is functioning properly.
A sample of farms is $1200, with a standard deviation of $350. Assume the data set has a bell-shaped distribution. Between what two values do about 95% of the data lie?
Please use the five-step process for hypothesis testing. The Connecticut Board of Education is concerned that first year female high school teachers are receiving lower salaries than their male counterparts.
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $2.91.
Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
Assumed that the standard deviation of the difference in the mean number of drinks is 6.7 drinks.
Computing the probability values using normal distribution - what proportion of licensed drivers are less than 30 years old?
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test. Would it be reasonable.
At the end of a year the change in participants' blood pressure over the year was measured, and the change was compared for the two groups.
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.
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