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In order to determine any difference between the average daily sales of two branches of a department store, the data below has been gathered. At a 5% level of significance, test to determine if there is a significant difference in the average daily sales of the two stores. What is your conclusion?
Downtown store Suburban store
Sample size 23 26
Sample mean $37,000 $34,000
Sample standard deviation $4,000 $5,000
Find the probability that the family's monthly gasoline purchases will be between 80 and 90 gallons. Find the probability that the family's monthly gasoline purchases will be less than 75 gallons.
Describe different methods of establishing correlation between variables and provide an example of each. Discuss the advantages and disadvantages of each method and where each must be applied.
On basis of these data, can college conclude that students in new program performed significantly better than rest of freshman class? Use a one-tailed test with α = .05.
Of the 500 students who responded to a survey about recycling on campus, 350 said they recycle on a regular basis. The sample proportion is ??
Describe the five steps of hypothesis testing. Compare Type I and Type II errors and give specific examples for each. Which error should be minimized the most and first?
Probability of a flush. Poker player holds flush when all 5 cards in hand belong to same suit (clubs, diamonds, hearts, or spades).
What should the cut-off score be for the interviews? (Round to nearest whole number).
Positive values correspond to students who gained weight and negative numbers correspond to students who lost weight. Is a weight fain of 15 pounds of (6.8) kilograms unusual?
in st. paul the annual unemployment rates in percentage during the years 1995-2000 are3.6 3.9 3.2 2.9 3.0 3.1and the
Automatic sensors to watch for lightening in a sample of 10 square kilometers. What are the mean and standard deviation of x, the mean number of strikes per square kilometer?
11 women and 9 men are the contestant in a competition. If 3 winners are ramdomly selected. what is the probability that they are all men?
What factors are most important in determining a research design? The response should be relevant to particular area of interest.
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