The mean annual incomes of certified welders are

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Chapter 12 / Exercise 5
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Caldwell
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The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. The alternate hypothesisis that the mean is not $50,000. If the level of significance is 0.10, what is the critical value?Student Answer:+1.645 -1.282 ±1.282 ±1.645 Question 8.Question :Based on the Nielsen ratings, the local CBS affiliate claims its 11 p.m. newscast reaches 41% of the viewing audience in the area. In a survey of 100 viewers, 36% indicated that they watch the late evening news on this local CBS station. What is the null hypothesis?Student Answer:H0: π = 0.36 H0: π = 0.41 H0: π ≠ 0.36 H0: µ = 0.41 -943953816MultipleChoice37True0-943953816MultipleChoice37
Question 9.Question :It is claimed that in a bushel of peaches, less than 10% are defective. A sample of 400 -943953818MultipleChoice60True0-943953818MultipleChoice60-943953817MultipleChoice54True0-943953817MultipleChoice54
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Statistics Unplugged
The document you are viewing contains questions related to this textbook.
Chapter 12 / Exercise 5
Statistics Unplugged
Caldwell
Expert Verified
peaches is examined and 50 are found to be defective. If α = 0.025, what will be the decision?
Question 10.Question :If the critical zvalue for a hypothesis test equals 2.45, what value of the test statistic would provide the least chance of making a Type I error?
Question :Using the following information:
0-943953815MultipleChoice51
Estimate the value of Ŷ when X = 4.Student Answer:10.45 3.73 8.718 -4.092
Question 2.Question :In regression, the difference between the confidence interval and prediction interval formulas is ________________.
r
Question 3.Question :A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned.
A regression ANOVA shows the following results:What is the value of the coefficient of correlation?Student Answer:+0.6317 +0.9754 -0.9754 +0.9513
Question 4.Question :Using the following information:What is the coefficient of determination? Round the percentage to one decimal point.
Question 5.Question :In the least squares equation, Ŷ= 10 + 20Xthe value of 20 indicates ____________.
X
X
Y
Question 6.Question :A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned.A regression analysis shows the following results:What is the Y-intercept of the linear equation?Student Answer:-12.201 2.195 -1.860 12.505
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