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A study regarding the relationship between age and the amount of pressure sales personnel feel in relation to their jobs revealed the following sample information. At the .01 significance level, is there a relationship between job pressure and age?
Degree of Job Pressure
Age(year).....Low....Medium.....High
less than 25...20.......18............22
25 up to 40....50.......46............44
40 up to 60....58.......63............59
60 and older..34.......43............43
The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error??
A certain airplane has two independent alternators to provide electrical power.
The null hypothesis is that the distribution of mother's educational level is the same for both treatment groups. The value of the chi-square statistic is 7.422. Evaluate the P-value
The scheduled commuting time on the Long Island Rail Road from Glen Cove to New York City is 65 minutes. Suppose that the actual commuting time is uniformly distributed between 64 and 74 minutes.
A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
What is the probability the circuit will last more than 3000 hrs. What is the probability the circuit will last between 2500 and 2750 hours and what is the probability the circuit will fail within the first 2000 hrs.
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
Compute the standard error of the sampling distribution of sample means.
What is the point estimate of the difference between the population mean expenditure for males and the population means expenditure for females?
In a regression analysis involving 27 observations, the following estimated regression equation was developed.
a. Determine the sample proportion, p, of households with cellular telephones that can be used to access the Internet. b. If the population proportion is 0.40, determine the standard error of the proportion.
Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
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