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Question 17 of 23 1.0...

Question 17 of 23 1.0 Points

A company has observed that there is a linear relationship between indirect labor expense (ILE) , in dollars, and direct labor hours (DLH). Data labor hours and indirect labor expense months are given in the file ILE_and_DLH.xlsx

Treating ILE as the response variable, use regression to fit a straight line to all 18 data points.

Based on your results, If direct labor hours (DLH) increases by one hour, the indirect labor expense (ILE), on average, increases by approximately how much?

Place your answer, rounded to 2 decimal places, in the blank. Do not use any stray punctuation marks or a dollar sign. , 34.56 would be a legitimate entry.

DLH(X) ILE(Y)

20 361

25 400

22 376

23 384

20 361

19 360

24 427.2

28 458.4

26 450.8

29 475.2

27 462.6

25 445

28 511

32 550.8

35 587.8

34 574.1

30 535.4

36 591.5

Part 11 of 16 -

Question 18 of 23 1.0 Points

Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. A random sample of 145 assemblies from team 1 shows 15 unacceptable assemblies. A similar random sample of 125 assemblies from team 2 shows 8 unacceptable assemblies.

If you are interested in determining if there is sufficient evidence to conclude, at the 10% significance level, that the two teams differ with respect to their proportions of unacceptable assemblies, what is the test value you would use to conduct such a test of hypothesis?

Place your answer, rounded to 2 decimal places, in the blank. , 2.34 would be a legitimate entry.

Part 12 of 16 -

Question 19 of 23 1.0 Points

Scores on a mathematics examination appear to follow a normal distribution with mean of 65 and standard deviation of 15. The instructor wishes to give a grade of “C” to students scoring between the 60th and 70th percentiles on the exam.

What score represents the 60th percentile score on the mathematics exam? Place your answer in the blank, rounded to a whole number. , 62 would be a legitimate entry.

Part 13 of 16 -

Question 20 of 23 1.0 Points

The personnel department of a large corporation wants to estimate the family dental expenses of its employees to determine the feasibility of providing a dental insurance plan. A random sample of 12 employees reveals the following family dental expenses (in dollars): 115, 370, 250, 593, 540, 225, 177, 425, 318, 182, 275, and 228.

Construct a 90% confidence interval estimate standard deviation of family dental expenses employees of this corporation.

Place your LOWER limit, in dollars rounded to 1 decimal place, in the first blank. Do not use a dollar sign, a comma, or any other stray mark. , 123.4 would be a legitimate entry.

Place your UPPER limit, in dollars rounded to 1 decimal place, in the second blank. Do not use a dollar sign, a comma, or any other stray mark. , 567.8 would be a legitimate entry.

Part 14 of 16 -

Question 21 of 23 1.0 Points

The annual returns, in percentages, on stocks A and B possible states of the economy are given in the table below.

Economy State

Probability

StockA

StockB

Good

0.5

40

20

Average

0.3

20

40

Bad

0.2

10

8

If one invested in StockA, what would be the expected annual percentage return? Place your answer, in percent, in the blank. , an expected 10 percent return would be recorded as 10. Do not use a percent sign.

Part 15 of 16 -

Question 22 of 23 1.0 Points

Suppose a firm that produces light bulbs wants to know whether it can say that its light bulbs typically last more than 1500 hours. Hoping to find support claim, the firm collects a random sample of n = 25 light bulbs and records the lifetime (in hours) of each bulb. The information related to the hypothesis test is presented below.

Test of H0: f$mu leq f$ 1500 versus H1: f$mu f$ > 1500

Sample mean 1509.5

Std error of mean 4.854

Assuming the life length of this type of lightbulb is normally distributed, if you wish to conduct this test using a .05 level of significance, what is the critical value that you should use? Place your answer, rounded to 3 decimal places in the blank. , 1.234 would be a legitimate entry.

Part 16 of 16 -

Question 23 of 23 1.0 Points

A jar contains four white marbles, five red marbles, and six black marbles. If a marble was selected at random, find the probability that it is white or black. Place your answer, rounded to 2 decimal places in the blank. 0.23 would be a legitimate entry.

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