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Q1. Suppose you form a confidence interval for a sample average and the population standard deviation is known. What happens to the width of the confidence interval as the sample size (n) increases? A. Becomes wider B. Becomes narrower C. Width does not change
Q2. You want to form a margin of error for your company's monthly average sales estimate, and you do not know the population standard deviation for the sales variable. Which statistical table do you use to compute the margin of error? A. Standard normal distribution B. F distribution C. Student's t distribution
Q3. You work in market analysis for a retail clothing store, and your team surveyed past customers to estimate the mean annual income per client. Suppose you want to test the null hypothesis that the population mean annual income is less than or equal to $60,000, and the alternative hypothesis states that the population mean is greater than $60,000. Is the critical value for making the test decision a positive or negative number? A. Critical value is positive B. Critical value is negative C. Critical value is zero D. We do not have enough information to answer this questionQ4. Suppose you are conducting a one-sided t-test, and the critical value for the test is 2.374. What happens to the critical value if you decrease the probability of a Type I error (alpha)? A. Critical value remains unchanged B. Critical value increases C. Critical value declinesQ5. When do we use matched-pair differences to test hypotheses about population means? A. The sizes of the two samples are unequal B. The variances of the two samples are the same C. The two samples are dependent D. The variances of the two samples are unknown
Find a 90% confidence interval for the population mean salaries of such personnel. Round your answer to the nearest dollar and don;t forget to use the $ sign.
You're responsible for planning parking needed for a new 256-unit apartment complex, and you're told to base the needs on the statistic 'average number of vehicles per household is 1.9'.
A researcher wished to estimate the number of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4%.
In this context, describe the Type I error possible. How might such an error impact ABI Insurance? In this context, describe the Type II error possible. How might such an error impact ABI Insurance?
Describe how the three interval estimates will be related to each other. Which of the three intervals is most likely to contain the population mean?
question suppose a test for a certain disease is given to mike. the probability of a positive test result is .98 if
For each of the following three populations, indicate what the sampling distribution for samples of 25 would consist of: Travel expense vouchers for a university in an academic year.
A Hot Fudge Sundae has on average 12 ounces of ice cream. If I were to set up a hypothesis test to test the ability of a new employee making the hot fudge sundae with an average of 12 ounces of ice cream
Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour, and your city is the first stop on the tour.
A random sample of 40 clock batteries of this brand was selected. There is the probability of 0.95 that the sample mean lifetime will be less than t hours.What is the value of t?
The researchers found that subjects who answered immediately made the best decisions and that "the longer our participants thought about their answers, the more likely they were to include irrelevant information at the expense of relevant informat..
A human society claims that less than 31% of U.S. households own a dog. In a random sample of 392 U.S. households, 155 say they own a dog. At a=0.03, is there enough evidence to support the society's claim?
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