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Assume a restaurant business succeeds 60% of the time. Suppose that there are three such restaurants open in your city. When they don't compete with one another, it is reasonable to believe that their relative success would be independent. [Hint:use binomial probability distribution function in Megastat or Phstat]
A) What is the probability that all the three businesses succeed?
B) What is the probability that all the three businesses fail?
C) What is the probability that at least one business succeeds?
A technician services machines as companies in the Phoenix area. Depending on the type of malfunction, the service call can take exactly 1, 2, 3, or 4 hours. The different types of malfunctions occur at the same frequency.
A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows:
If a student scored 90 points on a test where the mean score was 82.2 and the standard deviation was 5.7. What steps do I do to find out the student's z score?
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
Suppose a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit hour courses
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
Test the given claim using the traditional method of hypothesis testing.
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
A survey of 10 different suburbs in Dallas Texas found the average gasoline to be $ 1.294 a gallon with a standard deviation of $ .0526. What is the critical value using a=.05 and what is the test value.
A researcher discovers the number of parking tickets that a group of students have received during their driving careers. Twenty students reply and they have received between 9 and 20 parking tickets.
The times for 300 college students of introductory statistics to complete a one-hour times exam.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
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