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For these questions, the data set is given at this text's website. Assume that the data sets are from random samples and the distributions are Normal.
a. Find a 95% confidence interval for the difference between means, state whether it captures 0, and explain what that shows about the means.
b. Perform a hypothesis test to see whether the means are significantly different using a significance level of 0.05. Explain your conclusion clearly.
Shoes Compare the numbers of pairs of shoes for men and women. (Source: StatCrunch Survey: Responses to Shoe survey. Owner: scsurvey)
Chi-square tests are great to show if distributions differ or if two variables interact in producing outcomes. What are some examples of variables that you might want to check using the chi-square tests? What would these results tell you?
Develop a regression model to predict Costsbased on the Level of Productionand compare it to the dispersion obtained from the table above.
hamil sopa took a random sample of 60 invoices from his years records. the mean value of invoices in this sample was
Amalgamated Fruits, Vegetables, and Legumes, an agricultural company, breeds the experimental fruit "kiwana." The company is studying the effects of a new fertilizer on the number of kiwanas per bunch grown on kiwana trees. The regression analysis be..
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
Make a stem-and-leaf display of these gas prices. Use split stems; for example, use two 2.2 stems, one for prices between $2.20 and $2.24, the other for prices from $2.25 to $2.29.
How much should the financial manager of this office complex budget for energy costs for each quarter of 2012, based on seasonally adjusted trend estimates?
Vytorin is a combination pill designed to lower cholesterol. It consists of a relatively inexpensive and widely used drug, Zocor
a bag contains 10 red 12 green and 8 yellow marbles. assuming that all the marbles are equally likely to be picked from
The Card structure below represents a playing card with a face value and a suit. Using the main code given, set the cards in the deck array to be one of each kind of playing card.
Why can you not have a z- score equaling 0/0 ? what is problematic with calcutlating a z-score for a data set of repeated entries?
A total of 183 residents show up for a public hearing on the proposal, and a show of hands finds only 31 in favor of the prison project.
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