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Let Z be a standard normal random variable. Calculate the following probabilities using the calculator provided. Round your responses to at least three decimal places.
P(Z less than or equal to 0.69)=
P(Z greater than 1.58)=
P(-0.80 less than Z less than 2.14)=
Critique the HR manager's planned approach and give him advice on how to proceed. You can assume that a reasonable estimate for the proportion of new hires that are happy with the company is .8.
Of 260 females, 224 answered yes. Construct a contingency table to evaluate the probabilities. What is the probability that a respondent chosen at random:
A "random survey" was conducted of 3274 people of the "microprocessor generation" (people born since 1971, the year the microprocessor were invented). It was reported that 48% of those
Which option produces the smallest risk of a Type I error?
The mean of a normal probability distribution is 60; the standard deviation is 5.
A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
Suppose we wish to test the hypothesis H0: = µ2 vs. H1: = µ≠2 We find a two sided p-value of .03 and a 95% CI for µ of (1.5, 4.0) Are these two results possibly compatible? Why or why not?
We assume that we have selected two independent random samples from populations having proportions p 1 and p 2 and that p-hat 1 = 800/1000 and p-hat 2 = 950/1000
The rejection region for a two-tail test that uses the standard normal distribution is that area under the distribution lying
What is the purpose of statistical estimation? What statistics do you find most useful in regression analysis? Why?
Estimate the 95% confidence interval for the proportion of the electorate that support this policy.
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
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