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The average sales per store of ABC Inc.'s best-selling product in a supermarket chain last year was $12,000. A random sample of 61 stores selected from the chain shows that this year the average sales per store is $13,500 with a sample standard deviation of $12,000. Determine whether there has been a significant increase in the average sales per store.
Rachel is comparing three different recipes for chocolate fudge. She asks her friends to taste her fudge and rate how delicious it is. Her results are provided
an airline knows that 5 of the people making reservations on a certain flight will not show up. consequently their
Explain carefully why it would not be appropriate to perform a chi-square test for goodness of fit using these data.
If you are performing a hypothesis test using a z statistic in which you sampled 50 people and found an average SAT verbal score of 542.
a. What is the probability that an employee will have a salary between $12,520 and $25,480? b. What is the probability that an employee will have a salary more than $11,880? c. What is the probability that an employee will have a salary less than $28..
There are three versions of a board game released - version 1, version 2, and version 3. The versions are distributed equally and evenly among all potential sellers of board games.
a sample of 100 people is classified by gender malefemale and by whether or not they are registered voters. the sample
suppose that prior to conducting a coin-flipping experiment we suspect that the coin is fair. how many times would we
a researcher wants to determine if there is a significant difference in the standard deviations of the number of weekly
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
To find out whether the inhabitants of two South Pacific islands may be regarded as having the same racial ancestry, an anthropologist determines the cephalic indices of six adult males from each island, getting 1 = 77.4 and 2 = 72.2 and the corre..
Explain why you are making the recommendation and you must include a recommendation that maximizes profits and a recommendation that minimizes loss.
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