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1. Scores on the Wechsler Adult Intelligence Scale for the 20 to 34 age group are approximately normally distributed with mean equal to 110 and standard deviation equal to 25. If we select 100 people at random, what is the probability that this group will have an average score of 125 or above?
2. It is known that a healthy human body has an average temperature of 98.6?F, with a standard deviation of 0.95?F. Sixty healthy humans are selected at random. What is the probability that their temperatures average at least 99.1?F?
Indicate which of the following responses below is correct. Discuss why it is correct or discuss why standard deviation is such a valuable statistic in so many situations.
the comfort widget company makes several different sized widgets. the smallest widget the manufactures has a mean
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
a random sample of 6 music majors playing song s counted the number of mistakes each made. then these musicians played
You have been asked to analyse Grand Plomp Ltd, a maker of rocket widgets used by NASA. The owners are wondering whether the return received is sufficient to justify the risks taken in each division.
which of the following is not a decision variable when formulating the project crashing problem as a linear program?the
Construct a 95% confidence interval for the true average amount of time customers spent in the restaurant. With a .95 probability, how large of a sample would have to be taken to provide a margin of error of 2.5 minutes or less?
Employees of a local university have been classified according to gender and job type.
Discuss whether the percent distribution of the cross-tab and chi-square supports/does not support the researcher's hypothesis.
Of 880 respondents, 171 admitted that at least one light had been red. Follow four-step process to create 95% confidence interval.
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis?
The ACT is also distributed with meanof 21 and standard deviation of 4.7. Rachel wants to be in the 98th percentile on each test. What scores must she recieve on each exam?
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