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From past records, a department store finds that 70% of the people who enter the store will make a purchase on Black Friday. Suppose that 3 customers are randomly selected, answer the following questions.
a) The risk that workers in a manufacturing plant will be injured by machines and equipment.
People with type O-negative blood are universal donors. That is, any patient can receive a transfusion of O-negative blood. Only 7% of the American population have O-negative blood.
A rare disease has just broken out. Doctor Johnson is trying to help, but while treating patients he might expose himself to the disease.
Studies of ‘‘intellectually gifted'' children have generally defined the lower limit of their IQ scores at 140; approximately 1% of the population have IQ scores above this limit. Find the standard deviation of this distribution.
Discuss what would happen to someone's sleep if they choose to work more. Analyze whether the factors of totwrk, educ, and age are enough factors to explain the variation in sleep.
Using the information from question 1, construct a two-way table. Applying the chi-square analysis, test whether the variables "Gender" and "Lying"
a. Write down the point estimate for µ along with its standard error. b. Write down the margin of error at 0.8 con?dence level. c. Write down the 80% con?dence interval estimation for µ based on this sample.
which of the following pairs of class limits would be appropriate for grouping the numbers 10 13 8 and 15 ? explain why
A magazine publisher tells potential advertisers that the mean household income of its regular readership is $61,500. An advertising agency wishes to test.
To answer the question "Does the age of a heart attack patient vary by gender?" using a 2 sample independent t-test, what is the best formula for me to use?
What can you say about the banker's and contestant's attitude towards risk?
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
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