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Survey of subscribers to Forbes showed that 45.8% rented car during past 12 months for business reasons, 54% rented car during past 12 months for personal reasons, and 30% rented car during past 12 months for both business and personal reasons (Forbes 1993 subscriber study).
a) Determine the probability that the subscriber rented car during past 12 month for business or personal reasons?
b) Determine the probability that subscriber didn't rent the car during past 12 months for either business or personal reasons?
Do the data provide significant support for any preferences among the three brands? Test At the .05 level of significance.
you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a one sample or two sample test?
A researcher looks at the effect of 3 different drugs on 3 different groups of 10 people. Numbers refer to stress levels, with lower numbers being lower stress.
What is the appropriate procedure to test for a significant in different means between the 2 age groups. What is the p-value corresponding to your this answer and compute a 95% CI for the difference in means between the two groups.
A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.
The probability that student pilot passes the written test for a private pilot's license is 0.7. Find the probability that the student will pass the test: (a) on the third attempt (b) before the fourth attempt.
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
Is there evidence that teams with higher total payrolls tend to be more successful? Justify your answer.
Set up probability distribution by illustrating all x values and their associated probabilities. List sample space of tossing a fair coin.
A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per micro-liter) is measured. The sample mean is 5.23. The population standard deviation for red blood cell counts is 0.54.
Suppose the probability that a federal income tax return conatins an arithemetic error is 0.2. If 10 federal income tax returns are selected at random,
The Ohio Department of Highways is in the process of selecting a new paint for highway use. Four different paint companies have been contact regarding this need and each of the companies has supplied paint for testing.
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