Chapter 8: Q74E (page 500)
Given \({v_1}\,and\,{v_2}\) find the following probabilities:
- \({v_1} = 2,\,{v_2} = 30,\,p\left( {F \ge 5.39} \right)\)
Short Answer
- The probability is 0.01.
Chapter 8: Q74E (page 500)
Given \({v_1}\,and\,{v_2}\) find the following probabilities:
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Get started for freeThe data for a random sample of 10 paired observations is shown below.
Pair | Sample from Population 1 (Observation 1) | Sample from Population 2 (Observation 2) |
a. If you wish to test whether these data are sufficient to indicate that the mean for population 2 is larger than that for population 1, what are the appropriate null and alternative hypotheses? Define any symbols you use.
b. Conduct the test, part a, using.
c. Find a confidence interval for . Interpret this result.
d. What assumptions are necessary to ensure the validity of this analysis?
Independent random samples from two populations with standard deviations , respectively, are selected. The sample sizes and the sample means are recorded in the following table:
Sample 1 | Sample 2 |
a. Calculate the standard error of the sampling distribution for Sample 1.
b. Calculate the standard error of the sampling distribution for Sample 2.
c. Suppose you were to calculate the difference between the sample means . Find the mean and standard error of the sampling distribution .
d. Will the statistic be normally distributed?
Enough money has been budgeted to collect independent random samples of size from populations 1 and 2 to estimate localid="1664867109106" . Prior information indicates that . Have sufficient funds been allocated to construct a 90% confidence interval forof width 5 or less? Justify your answer.
Hospital work-related injuries. According to an Occupational and Health Safety Administration (OHSA) 2014 report, a hospital is one of the most dangerous places to work. The major cause of injuries that resulted in missed work was overexertion. Almost half (48%) of the injuries that result in missed work were due to overexertion. Let x be the number of hospital-related injuries caused by overexertion.
a. Explain why x is approximately a binomial random variable.
b. Use the OHSA report to estimate p for the binomial random variable of part a.
c. Consider a random sample of 100 hospital workers who missed work due to an on-the-job injury. Use the p from part b to find the mean and standard deviation of, the proportion of the sampled workers who missed work due to overexertion.
d. Refer to part c. Find the probability that the sample proportion is less than .40.
Given that xis a binomial random variable, compute P(x)for each of the following cases:
a. n= 7, x= 3, p= .5
b. n= 4, x= 3, p= .8
c. n= 15, x= 1, p= .1
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