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AA random sample of 16 students showed aht the variance in the number of hours they spend studying for a final exam was 25 hours^2.
a) Construct a 95% confidence interval for the population variance and standard deviation of hours spent studying. Assume the population of hours spent studying is normally distributed.
b) Test, at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the Critical value approach.
Can you envision circumstances under which these outcomes would not be normally distributed? Provide three distinct examples of the business outcomes that are not normally distributed.
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities.
Consider the continuous random variable X, which has a uniform distribution over the interval from 20 to 28. The probability that X will take on a value between 21 and 25 is.
The CEO of the business has nothing better to do wheras measured the temperatures of 26 department managers 1 to 4 times every day to get a total of 123 measurements.
Find the probability of a Type II error if in fact the mean waiting time is actually 9.8 minutes.
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
Find out equation of the line of best fit. Find out r - Is there a strong relationship?
Determine the test value? Use α = 0.05. (Use the variances unequal formula).
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
An election coming up next week promises to be very close. In fact, assume that 50% are in favor and 50% are against. Suppose you conduct a poll of 791 randomly selected likey votes. Approx. how different will the percent in favor (from the poll) ..
A study published in the New England Journal of Medicine (Aug. 2001) suggests that it's dangerous to enter a hospital on a weekend. During a 10-year period, researchers tracked over 4 million emergency admissions to hospitals in Ontario, Canada. T..
State the statistical assumptions of this test Using the data set you have selected, select independent and dependent variables.
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