# The mean annual incomes of certified welders are

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Chapter 12 / Exercise 5
Statistics Unplugged
Caldwell Expert Verified
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. 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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