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1) The program office budgets $30,000 per program review at the contractor's site. Your concern for "end of year" spending drills is that you have budgeted enough for the reviews (i.e. you are only concerned if the actual costs are higher than the $30,000 target). A sample of 16 trips yielded a mean of $32,500 and a standard deviation of $3,500. Test the budgeted amount at the 80% level of confidence. Select the correct answer out of each pair of choices. (Carry intermediate calculations to three decimal places.)
Why does the sample size play such an important role in reducing the standard error of the mean? What are the implications of increasing the sample size?
Suppose a simple random sample of size n = 34 is obtained from a population with μ = 30 and σ = 4. Is the sampling distribution of x approximately normal.
during the past six months 73.2 of us households purchased sugar. assume that these expenditures are approximately
What does standard deviation measure? In looking at the standard deviations of the "with fireplace" and "without fireplace" selling prices, one is much larger than the other.
Minutes of activity for lean people gad N(526, 107). Withink what limits do active minutes for about 95% of people in each group fall? Use the 68-95-99.7 rule.
A biologist studying wolves wants to find a correlation between the lifespan of wolves and the geographic latitude of their habitats. How many variables are involved in such an analysis?
The number of degrees of freedom for the appropriate chi-square distribution in a test of independence is:
Given a normal distribution with a mean of 100 and a standard deviation of 10, what is the probability that
Why is transportation planning an important aspect of global freight movement? What types of planning must be done?
Poisson random variable with a mean rate of 8 messages per hour. What is the probability that fewer than three messages are received in one-half hour?
70 of light aircraft that disappear while flying in a certain country are subsequently discovered. of the aircraft that
A Pew research study recently randomly selected two groups of people, men and women and asked them if they agree with the following statement:
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