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A student researcher compares the heights of men and women from the student body of a certain college in order to estimate the difference in their mean heights. A random sample of 18 men had a mean height of 68.9 inches with a standard deviation of 2.79 inches. A random sample of 8 women had a mean height of 64.1 inches with a standard deviation of 2.49 inches. Determine the 80% confidence interval for the true mean difference between the mean height of the men and the mean height of the women. Assume that the population variances are equal and that the two populations are normally distributed.
Find the standard error of the sampling distribution to be used in constructing the confidence interval. Round your answer to two decimal places.
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
the weekly amount spent for maintenance and repairs in a certain company has an approximately normal distribution with
1. an article in the washington post on march 16 1993 stated that nearly 45 percent of all americans have brown eyes. a
a poll of 1200 randomly selected students was conducted and found 58 favor decriminalizing all drug use that is
Any movie trailer that lasts beyond 4 minutes and 30 seconds is considered too long. What proportion of movie trailers is too long?
If we multiply all the Y values in the data by 2 (and keep the X values the same as the original), what will the new regression equation be?
4. Three hundred students took a chemistry test. You sampled 50 students to estimate the average score and the standard deviation. How many degrees of freedom were there in the estimation of the standard deviation? (Justify for full credit)
The lifetime of a super tough AAA battery is normally distributed wit mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random
Simulate 200 samples of n = 10 responses for HrsSleep. Show the commands you used, or explain how you did the simulation.- Draw a histogram of the 200 sample means.
The lower limit for a 95% confidence interval for the population proportion if a sample of size 200 had a 40 success is.
The mean age of graduate students at a University is at most 31 y ears with a standard deviation of two years. A random sample of 15 graduate students is taken.
The calculated value for t is -1.501, The test is a left tailed test. The n is 20. What is the best estimate of the p value used the student t table. Please show solutions
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