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1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.3 miles per gallon. a. That is the probability that a randomly selected hybrid gets more than 61 miles per gallon? b. What is the probability that a randomly selected hybrid gets 51 miles per gallon or less? c. What is the probability that a randomly selected hybrid gets between 57 and 62 miles per gallon? d. What is the probability that a randomly selected hybrid gets less than 46 miles per gallon?
2. Suppose a geyser has a mean time between eruptions of 94 minutes. If the interval of time between the eruptions is normally distributed with standard deviation 35 minutes, answer the following questions.
(a) What is the probability that a randomly selected time interval between eruptions is longer than 108 minutes?
(b) What is the probability that a random sample of 17 time intervals between eruptions has a mean longer than 108 minutes?
(c) What is the probability that a random sample of 41 time intervals between eruptions has a mean longer than 108 minutes?
(d) What effect does increasing the sample size have on the probability? Provide an explanation for this result. Choose the correct answer below.
(e) What might you conclude if a random sample of 41 time intervals between eruptions has a mean longer than 108 minutes? Choose the best answer below.
A. What is the 90% confidence interval for the daily sales at all restaurants. B. What is the probability that the average sales are really $32,000 or more per day? Assume that the population average is $30,000 per day and the std. Deviation is $2..
Which of the following preference orderings, if any, could characterize his preferences? Tell me any/all that apply, and explain how you know this.
question a particular firm carried out an extensive study into the costing of a specific type of project. it was found
what are the appropriate h0 and ha for each of the following research studies? in addition note whether the hypothesis
according to a report by scarborough research the average monthly household cellular phone bill is 73. suppose local
A retailer finds that the demand for a very popular board game averages 100 per week with a standard deviation of 20. If the seller wishes to have adequate stock 95% of the time.
What is the probability that a person who has submitted one entry will win the following?
1.a researcher wished to compare the average amount of time spent in extracurricular activities by high school students
q1. records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed with a
Mr. price Home analyzed the value of purchase made on credit by a sample of 25 credit card customers. The simple mean was found to be R170.08 with a sample standard deviation of R21.90. Assume purchase values are normally distributed.
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
A sample of 200 college students resulted in the numbers below. At "alpha" = 0.05, can we conclude that opinions of college students differ from those in the national survey of adults?
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