Business Statistics FAST HELP!

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Category:
Statistics
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Question description

A random sample of 23 items is selected from a population. To determine the appropriate critical t-value what number of degrees of freedom should be used?

24
28
23
22

On a very hot summer day, 8 percent of the production employees at Midland States Steel are absent from work. The production employees are randomly selected for a special in-depth study on absenteeism. What is the probability of randomly selecting 12 production employees on a hot summer day and finding that none of them are absent?

0.386
0.434
0.368
0.354
The following is a binomial probability distribution with n = 3 and π = 0.17.

X P(x)
0 0.572  
1 0.351  
2 0.072  
3 0.005  

The mean of the distribution is
2.80
0.28
0.51
0.70
The mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the mean. He selects a random sample of 47 trucks passing the weighing station and finds the mean weight is 21.9 tons. The population standard deviation is 3.2 tons. What is the 95 percent interval for the population mean?
21.1 and 22.7
21.0 and 22.8
21.3 and 22.5
22.0 and 23.8

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