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A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 270 students was xbar = 137 minutes. Suppose that we know that the study time follows a Normal distribution with standard deviation = 65 minutes in the population of all first-year students at this university. Use the survey result to give a 99% confidence interval for the mean study time of all first-year students.
General scores on academic performance in english language using 60 participant. let the highest score be 90 and 10. use a class inertval of 10 create your class interval and frequency and use the information to answer.
a store wishes to predict net profit as a function of sales for the next year. the following table gives the years 1998
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
a sample of 16 items provides a sample standard deviation of 9.5. test the following hypotheses using a .05.? 0 s 2
1. a large tank of fish from a hatchery is being delivered to a lake. the hatchery claims that the mean length of fish
there are 4000 mangoes in a shipment. it is found that it has a mean weight of 15 ounces with a standard deviation of
A sociologist wants to describe if the life expectancy of people in Africa is lesser than the life expectancy of people in Asia.
Conclude that the population average pulse rate is 71.8. Reject the hypothesis that the population average pulse rate is 70.
1. using the data collected from the student data survey at the beginning of the course construct a
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. Check the normality assumption.
A social psychologist is studying college students attitudes toward drinking and driving. He is specifically interested in attitude change as a result of years in college and of viewing the consequences of drinking and driving accidents.
Body mass index is calculated by dividing a persons weight by the square of his or her height; it is a measure of the extent to which the individual is overweight.
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