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A Shell oil company executive says that a majority of workers (more than 50%) prefer a 10 hour four day work week over an 8 hour five day work week. Of a 105 worker sample, 67 said they prefer a 10-
Suppose the historical average work week was 39.2 hours and SD was 4.8 hours as reported by the Department of Labor. This year a study of 112 workers showed a mean of 38.5 hours.
Suppose a 95% confidence interval is computed for u resulting in the interval (112.4, 121.6). Then it would be accurate to say
Find the sample standard deviation. Find the 99% confidence interval for population mean?
A study showed that 110 of 200 people say that their major source of news is TV. If the confidence interval is between 48% and 62% do you think that the range satisfactory or too narrow or wide and
Suppose that we draw one card from a deck of 52 playing cards. What is the probability that the card will either be a king or a heart?
ranslate the excerpt below into a confidence interval for p and approximate the value of the level of confidence, c. In a survey of 8448 adults, 29.9% said they were taking vitamin E as a supplement
The financial industry Earnings per share last year were $3. This year, earnings per share in 10 financial companies were as follows. Test the hypothesis that this year's earnings differ from last y
Construct the confidence interval for the population mean
If the number of people that voted for the candidate in the sample is 0, do you think that this could be used as a proof to contradict the candidate's pronostic? Back your claims with quatitative in
The joint distribution of a proportion of votes for candidate X and a proportion of votes for candidate Y is given by fx,y(x,y)=1, 0<=x<2, 0<=y<=1, 2y<=x.
A government survey conducted to estimate the mean price of houses in a metropolitan area is designed to have a margin of error of $10000. Pilot studies suggest that the population standard deviatio
Give a 95% confidence interval for the difference in the proportions. Calculate for [larger] - [smaller]. What is the lower confidence limit for the 95% CI?
Give a 95% confidence interval for the difference in the two proportions. (Be sure to let population 1 correspond to the group with the higher proportion so that the difference will be positive.)
Specify the approximate sampling distribution of the sample proportion of women who worked last summer, p-hat(w). What is the mean?
Twenty-five job applicants are randomly selected from one large university and they produce a mean score and standard deviation of 183 and 12, respectively. Use a 0.05 level of significance to test
Assume that the shower times are normally distributed with a standard deviation of 2.2 minutes. Find the percentage of guest who shower no more the 8 minutes.
Examine the given statements then express the null hypothesis and alternative hypothesis in symbolic form. Be sure to use the correct symbol (? , p, ?) for the indicated parameter.
An automobile manufacturer would like to know what proportion of its customers are dissatisfied with the service received from their local dealer. The customer relations department will survey a ran
What is the lower limit of the confidence interval? What is the upper limit of the confidence interval?
Let Y be b(192,p). We rehect H0:p=0.75 and accept H1: p>0.75 if and only if Y>=152. Use the normal approx to determine.
Develop a 95% confidence interval estimate of the mean annual salary for all sales persons, regardeless of years of expirience and type of position.
The average/mean of time waiting for a heart transplant is 132 days, and. the standard deviation is 19.8 days. What is the least amount of days spent waiting for a heart that would still place a pat