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In a survey of 400 students in a school district, it is found that 340 students use computers in school. Test the claim that the proportion of students in this district who use computers in school is at least 80%. State the correct hypotheses.
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
Develop a linear regression equation for these data and forecast how much money Robert will win if he spends $30.
Construct the 95 percent confidence interval for the proportion of all welders who graduated from a registered welding course.
What is the probability that their average lifetime would be less than 510 hours? Use your calculator to solve this problem and give your answer as a number between 0 and 1, rounded to 3 decimal places.
A cyclist traveled at a rate of 32 mph to visit a nearby town. The cyclist averaged 10 mph on the return trip. If the round trip took 6.3 hours, find the distance to the nearby town.
When finding percentiles, if locator L is not whole number, one procedure is to interpolate so that locator of 23.75, for instance.
Find the proportion of female college students whose height is greater than 65 inches. Then find the proportion of female college students whose height is no more than 65 inches.
A contingency table has 5 rows and 4 columns. How many degrees of freedom are there?
Standard deviation of 424 and 155 respectively. at the .05 level of significance, test the claim that the new version has standard deviation equal to that of the past version.
Assume that the heights of adult white men have a mean of 67.9 inches and a standard deviation of 2.8 inches. If 64 men are randomly selected, find the probability that they have a mean height greater than 68.9 inches.
You wish to do a community needs assessment survey of a community to find out how much office space is needed by professionals in the community.
Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
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