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He selected a sample of 100 boxes that had been tampered with and ascertained that, for 47 of the boxes, the missing pants, shoes, and so on were attributed to shoplifting. For 52 other boxes, employees had stolen the goods, and for the remaining 1 boxes he blamed poor inventory control. In his report to the mall management, can he say that shoplifting is twice as likely to be the cause of the loss as compared with either employee theft or poor inventory control and that employee theft and poor inventory control are equally likely? Use the 0.01 significance level.
The American Automobile Association checks the prices of gasoline before many holiday weekends. Listed below are the self-service prices for a sample of 15 retail outlets during the May 2003 Memorial Day weekend in the Detroit
Use the sales data given below determine: a) The least square trend line.
Formulate the hypothesis that can be used to determine whether the sample data support the hypothesis that the mean fuel efficiency rating for midsize cars is greater than the mean fuel efficiency for large cars.
A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the linear regression model:
Test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-Value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
What is the probability that in a sample of 10 pieces: 5 or more will be defective?
What is the appropriate conclusion based on the outcome of the hypothesis test?
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course:
Can we conclude that car size is dependent on marital status? YES or NO (circle one)
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
Based on these data, what is the probability that next Christmas will be dry and based on the data,what is the probability that next Christmas will be rainy or cloudy and dry?
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