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The Gibbs Baby Food Company wants to compare the weight gain of infants using their brand versus their competitor's.
The manufacturer of Glo-More flatwhite interior latex paint claims one-coat coverage of 400 square feet per gallon on interior walls.
In a Gallup poll, 1,402 randomly selected adults were surveyed and 396 of them smoked in the past week. Use (alpha) = .10 to test the claim
In order for applicants to work for the state department, they must take a test in the language of the country where they plan to work
For the samples summarized below, test the hypothesis at = 0.5 that the two variances are equal.
In recent years, the interest rate on home mortgages has declined to less than 6.0 percent. However, according to a study by the Federal Reserve Board
For items 1 to 4, select the best statistical analysis technique for the following research topics. Be very precise about your statistical choice
Tea Drinkers A tea drinker's society estimates that the mean consumption of tea by a person in the United States is more than 7 gallons per year.
Mathematics Assessment Tests In Illinois, a random sample of 85 eighth grade students has a mean score of 265 with a standard deviation of 55
The Manager at a light bulb factory wants to determine whether there is any difference in the mean life expectancy of light bulbs manufactured
The manager of a paint supply store wants to determine whether the mean amount of paint conatined in 1- gallon cans purchase
A study to see how well marital dissolution was predicted by the personality scores of husbands and wives was published in the Journal of Personality
The mean heart rate(beats per minute) for a random sample of 31 patients with congestive heart failure who were given Captopril was 75.2 bpm
Mean score on 10 item test for all students enrolled in a Traditional course was 9.64. A random sample of 41 students in Project Course is given same test
Hypothesis test for two independent proportions
Faced with rising FAX costs, a firm issued a guideline that transmissions of 10 or more should be sent by 2-day mail instead
A fast-food franchiser is considering building a restaurant at a certain location. Based on financial analysis, a site is acceptable only
Say a fast-food franchiser is considering building a restaurant in a local mall. According to franchise headquarters, a site is acceptable only
Using ratio or interval numerical data from the data set attached, develop the following:
State your null and alternative hypothesis for the following cases. Please explain how do you make that decision on which is alternative and which is null.
Explain the difference between testing a single mean, testing the difference between two means from an "independent sample" and testing mean differences
A National retail chain has 7 different strategies (S1 to S7) to increase its sell. None of these strategies work all the time
A certain type of cable was advertised as having a breaking strength of 1000 pounds. A test of XX pieces of this cable was conducted and the mean
A steel pipe fittings company claims that the yield strength of its non-tempered couplings is more variable than that of its tempered couplings
A legal researcher is studying the age distribution of juries by comparing them with the overall age distribution of available jurors