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The manager of a sports store is considering trading on Public holidays. She believes that a majority of consumers would consider visiting the sports store on a Public holiday. She takes a random sample of 50 customers and finds that 29 would visit the sports store on a Public holiday. Is there significant evidence to support the manager's claim? Test at the 5% level of significance.
A population is normally distributed with a mean of -30 and a standard deviation of 5.
Compute Pearson's correlation coefficient between age and amount spent on this particular product.
A researcher found that individuals who adhered to a strict vegan diet did not have any lower levels of activity than individuals who had other diets.
What is the z a/2 for a confidence level of 95%, the margin error of this sample and give a 95% confidence interval for the mean weight of boxes produced based on the sample mean of 16.4?
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
Powerball is a lottery game. It involves choosing five white balls from a drum containing 55 balls and one red ball from a drum containing 42 balls. A player must match all five white balls and the red ball to win the jackpot.
Summary data for two independent samples are p1 = 0.31, n1 = 400, and p2 = 0.38, n2 = 500. Use the 0.05 level of significance in testing H0: π1 = π2 versus H1: π1 ≠ π2.
Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.
calculate a regression line to predict weight from height for these data from sophomore women.height inches weight
The attention span of a two year-old is normally distributed with a mean of about 9 minutes and a standard deviation of 1.75 minutes. Suppose we randomly survey 60 two year-olds. What is the probability that a two year old has an attention span of..
The largest salary on the list is $100,000 and is accidentally changed to $1,000,000. What is the new standard deviation?
a die with 6 facts but only marked two facets with 1 and rest 4 facets with 2 if we throw this die 60 times we expect
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