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In a sample of 60 mice, a biologist found that 46% were able to run a maze in 30 seconds or less. Find the 99% limit for the population proportion of mice who can run that maze in 30 seconds or less?
a. 31.0% < p < 61.0%
b. 21.1% < p < 70.9%
c. 37.7% < p < 54.3%
d. 29.4% < p < 62.6%
What is meant by illusionary correlations? Why is it so difficult for individuals to disprove their beliefs in correlations that are actually false?
An experiment was conducted to compare the effectiveness of three training programs, A, B, and C, in training assemblers of a piece of electronic equipment.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
The area under the standard normal curve between 0 and 2 is twice the area under area between 0 and 1.
Find the mean number of radioactive atoms lost through decay in a day. Find the probability that on a given day, 50 radioactive atoms decayed.
A marketing research firm wishes to estimate the proportion of adults who are planning to buy a new car in the next 6 months. A simple random sample of 100 adults led to 22 who were planning to buy a new car in the next 6 months.
A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
Critically discuss why you would or would not expect each of the following variables to be normally distributed.
What is the proportion of people surveyed that rated the subway system from 3 to 4. What is the proportion of people surveyed rated the Subway System from 1 to 3.
In the past, Bly has tended to estimate warranty expenses on the high end to be conservative. He must work with the dealership's accountant at year-end to arrive at the warranty expense accrual for cars sold each year.
During the period of time phone-in reservations are being taken at a local university, calls come in at a rate of one every ten minutes.
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
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