The business college computing center wants to determine the proportion of business students who have laptop computers. If the proportion differs from 30, then the lab will modify a proposed enlargement of its facilities.
Suppose a hypothesis test is conducted and the test statistic is 2.5. Find the p-value for a two-tailed test of hypothesis.
A) .0062 B) .0124 C) .4876 D) .4938
Q. 2The number of road construction projects that take place at any one time in a certain city follows a Poisson distribution with a mean of 3. Find the probability that more than four road construction projects are currently taking place in the city.
A) 0.815263 B) 0.647232 C) 0.184737 D) 0.352768
Q. 3The number of road construction projects that take place at any one time in a certain city follows a Poisson distribution with a mean of 4. Find the probability that exactly three road construction projects are currently taking place in this city.
A) 0.247261 B) 0.168031 C) 0.195367 D) 0.132766
Q. 4A bottling company produces bottles that hold 8 ounces of liquid. Periodically, the company gets complaints that their bottles are not holding enough liquid.
To test this claim, the bottling company randomly samples 16 bottles and finds the average amount of liquid held by the bottles is 7.7 ounces with a standard deviation of .4 ounce. Calculate the appropriate test statistic.
A) t = -2.905 B) t = -1.897 C) t = -12.000 D) t = -3.000
Q. 5A marketing research company is estimating which of two soft drinks college students prefer. A random sample of
What will be an ideal response?
Q. 6A scientist is hoping to compare the mean levels of DDT toxin found in three species of fish in a local river. He randomly samples 50 of each species to use in the analysis. For each fish, he measures the amount of DDT toxin present.
Ideally he will be able to rank the species based on the mean level of toxin found in each of the three species. How many factors are present in this study?
A) 1 B) 3 C) 50 D) 6
Q. 7A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful only if the average time spent on a delivery does not exceed 27 minutes.
The owner has randomly selected 17 customers and delivered pizzas to their homes in order to test whether the mean delivery time actually exceeds 27 minutes. What assumption is necessary for this test to be valid?
A) The sample mean delivery time must equal the population mean delivery time.
B) None. The Central Limit Theorem makes any assumptions unnecessary.
C) The population variance must equal the population mean.
D) The population of delivery times must have a normal distribution.
Q. 8The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 1900 miles.
What is the probability a certain tire of this brand will last between 56,010 miles and 56,580 miles?
A) .9813 B) .4649 C) .4920 D) .0180
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