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Refer to given Exercise. Suppose the truth is that .12, or 12%, of the students are left-handed and you take a random sample of 200 students. Draw a picture similar to given Figure, showing the possible sample proportions for this situation.
Exercise Suppose you want to estimate the proportion of students at your college who are left-handed. You decide to collect a random sample of 200 students and ask them which hand is dominant. Go through the conditions for which the sampling distribution of a sample proportion is approximately normal, and explain why they would apply to this situation.
for a one-tailed hypothesis test the critical z-value of the test statistic is -1.48. which of the following is true
Derrick scored an 80 on both tests. Julie scored a 70 on the first test and a 90 on the second. They both totaled 160 points on the two exams, but Julie claims that her total is better. Explain.
Tthe mean amount of paint per 1-gallon can is 1.00 gallons. Use a significance level of 0.05. Is (are) the critical region(s) for this test in the left tail, right tail, or both tails?
A certain disease occurs in 35% of the population. A test for the disease is fairly accurate: it misclassifies people with the disease as healthy 6% of the time and reports that a healthy person is diseased just 7% of the time.
A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing and requiring repairs and service.
A certain map is drawn so that a distance of 0.5 inch on the map represents 12.5 miles of actual distance. If the distance between two towns is 4.5 inches on the map, what is the actual distance, in miles, between the two towns?
A manufacturer of microwaves gathers information on microwave sales from a random sample of 50 stores in a large retail chain. In the sample, the mean number of microwaves sold per store last week was 19, with standard deviation 2.
Construct separate relative frequency histograms for the survival times of both thetherapies. Compare the two histograms. Does the new therapy appear to generate a longer survival time? Explain your answer.
In general, on what basis are independent variables selected for entry into the equation during stepwise regression?
a farm brings 15 tons of watermelons to market. find 95 confidence interval for the population mean? given a population
heights of women have a bell-shaped distribution with a mean of 156 cm and a standard deviation of 8cm using the
In the biology class the mean score was 79 with standard deviation 5.
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