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In a batch of 8,000 clock radios 6o/o are defective. A sample of 5 clock radios is randomly selected without replacement from the 8,000 and tested. The entire batch will be rejected if at least one of those tested is defective. What is the probability that the entire batch wili be rejected?
You are the general marketing manager of Ford Motor company. The CEO of the company asked you to assess the viability of producing alternative fuel automobiles (ex, ethanol).
A large industrial firm uses 3 local motels to provide overnight accommodations for its clients. From past experience it is known that 20% of the clients are assigned rooms at the Ramada Inn, 50% at the Sheraton, and 30% at the Holiday Inn.
Using bar charts to compare observed frequencies between variables can be problematic when?
In the end, of course, conclusions are drawn about how an entire population would respond based on the responses from randomly selected group of people.
A test of hypothesis is conducted at the .05 level of significance to test either or not the population correlation is zero.
Given the following number of hours between breakdowns for 4 machines, are the machines significantly different? If so, how are they different? Which machine is the best? Which machine is the worst?
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
The National Center for Education Statistics reported that 47% of college students work to pay for tuition and living expenses. Assume that a sample of 450 college students was used in the study.
Determine the confidence level used for the given confidence interval.
Calculate the mean difference for the following data. The scores are the number of pictures the participants remembered correctly out of 20.
Examine the two standard deviations. What do these indicate about the range of benefits enjoyed by the two groups?
According to Chebyshev's theorem, proportion of values from data set that is further than 2 standard deviations from the mean is at most?
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