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Cashier records from the last year show that 35% of all Ralph's grocery store customers use a previously-obtained Ralph's discount card upon checkout. Management suspects the percentage of actual cardholders is higher because some customers may not use their Ralph's card during every visit. They decide to sample random customers who enter the store, and ask them if they have a Ralph's card. Suppose they solicit 400 customers one day, and find that 160 of them have a Ralph's card.
Define a game and prepare the odds of winning. The game could be a card game with two cards or a dice game. Use MS-Excel (if possible) to solve this problem
A female student wants to determine whether or not students at the college like the cafeteria's food. Why might the results of this survey be inaccurate?
Suppose a bookie will give you $6 for every $1 you risk if you pick the winner in 3 ballgames. For every $1 bet, you either lose $1 or gain $6. What is the bookies expected earnings per dollar wagered?
Suppose also that after selecting 15 members at random we obtained the following paired observations: Use these data to find the covariance between age and the number of visits.
A company has 25 cars of this model. What is the probability that the mean nitrogen oxide emissions of these cars is above the 0.3g/mi limit?
If another sample of 1000 companies is taken, do you expect the sample mean to be 7.2 again? Why or why not? Repeating this experiment many times with different samples.
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
For the 20 test scores shown, find the percentile rank for a score of 86.
A scatter diagram that plots the values of the residuals against the values of the dependent variable
Develop upper and lower control limits (99.7%) for the proportion of students with complaints.
Obtain a test statistic and p-value. Interpret the results at = .01.
A random sample of 72 statistics students was taken to estimate the proportion of students who are also in the Math Club. The 90% confidence interval was 0.438 to 0.642. Using this information, what sample size would be necessary to estimate the t..
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