In-Class Exercises Quiz 07 PDF

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25/10/2020

In-Class Exercises Quiz 07

My LMS Subjects / 2020-BUS1BAN(BU_BE_MI_SH_AW_C3_CF-SEM2) / ✔ Assessments / In-Class Exercises Quiz 07

Sunday, 18 October 2020, 11:23 PM Finished Sunday, 18 October 2020, 11:42 PM 19 mins 26 secs out of 15.00 ( Question 1

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A teacher stated that the average number of students absent per week was taken to test the teacher's claim. Which of the following is the corr

Correct Mark 1.00 out of 1.00

Select one: a. H0: μ > 2 against HA : μ < 2. b. H0: μ < 4 against HA : μ ≠ 4. c. H0: μ = 2 against HA: μ ≠ 2.  d. H0: μ = 4 against HA: μ ≠ 4. The correct answer is: H0: μ = 2 against HA: μ ≠ 2.

Question 2

When would the null hypothesis be rejected at the 0.05 level of signica test with a sample size of 40, where the population variance is known?

Incorrect Mark 0.00 out of 1.00

Select one: a. If the test statistic is greater than 1.68. b. If the test statistic is less than 1.645.

25/10/2020

Question 3

In-Class Exercises Quiz 07

A regression analysis between height y (in cm) and age x (in years) of 2 the least squares line y-hat = 87 + 6.5x. This implies that by each additi

Correct Mark 1.00 out of 1.00

Select one: a. increase by 93.5cm. b. increase by 6.5cm.  c. increase by 87cm. d. decrease by 6.5cm.

The correct answer is: increase by 6.5cm.

Question 4

In simple linear regression, most often we perform a two-tail test of the determine whether there is sucient evidence to infer that a linear relat

Correct

following best describes the null and alternative hypotheses needed fo

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Select one: a. Ho: β0 = 0 H A: β 0 ≠ 0 b. Ho: β1 ≠ 0 H A: β 1 = 0 c. Ho: β 0 = 0 H A: β 0 ≠ 0 d. Ho: β1 = 0 H A: β 1 ≠ 0  The correct answer is: Ho: β 1 = 0 H A: β 1 ≠ 0

Question 5

Consider the estimated regression equation ŷ = 430 + 36x. What is the for y when x is equal to 10?

Correct Mark 1.00 out of 1.00

Select one: a 790 

As ŷ = 430 + 36x

25/10/2020

In-Class Exercises Quiz 07

Question 6

Light globes produced by a manufacturing company have had a life ex of an improved production process, the company believes that there ha

Correct

expectancy of its light globes. A sample of 42 globes showed an averag information, it is known that the standard deviation of the population is whether there has been an increase in the life expectancy of the light g calculated test statistic and what conclusion can be made at the 10% l

Mark 1.00 out of 1.00

Select one: a. z = 1.35; reject the null hypothesis. 

b. z = 2.33; reject the null hypothesis. c. z = 0.088; do not reject the null hypothesis. d. z = 0.208; do not reject the null hypothesis.

The correct answer is: z = 1.35; reject the null hypothesis.

Question 7

For a two-tail Z test, the null hypothesis will be rejected at the 0.05 lev the standardised test statistic is:

Correct Mark 1.00 out of 1.00

Select one: a. smaller than -1.645. b. greater than 1.96. c. smaller than -1.645 or greater than 1.645. d smaller than -1 96 or greater than 1 96 

25/10/2020

In-Class Exercises Quiz 07

Question 8

Which term represents the dependent variable in the rst-order linear m

Correct

Select one:

Mark 1.00 out of

a. ε

1.00

b. β1 c. y.  d. x.

The correct answer is: y.

Question 9 Incorrect Mark 0.00 out of 1.00

A researcher wanted to formalize the relationship between study time a Statistics subject. The researcher took a random sample of 100 studen asked each student to report the average amount of time he or she stu mark received. The Table below reports Excel regression output for y = marks out of 100 and x= study time in hours.

Select one: a. Testing for a linear relationship is equivalent to testing for a slo i.e. H 0: β1=0 and H A: β1≠0 b. We can test for the existence of a liner relationship between y a this case is 19.443 which is greater than tα/2,n-1 at 5% level of signi null hypothesis and conclude that a linear relationship between the t c. We can test for the existence of a liner relationship between y a

25/10/2020

In-Class Exercises Quiz 07

Question 10

A researcher wanted to formalize the relationship between study time a Statistics subject. The researcher took a random sample of 100 studen

Correct

asked each student to report the average amount of time he or she stu mark received. The Table below reports Excel regression output fory = marks out of 100 and x= study time in hours.

Mark 1.00 out of 1.00



 Select one: a. ŷ = 21.590 + 1.877 x.  b. ŷ = 1.877 + 21.590 x. c. ŷ = 21.590 - 1.877 x. d. ŷ = 1.877 - 21.590 x.

The correct answer is: ŷ = 21.590 + 1.877 x.

25/10/2020

In-Class Exercises Quiz 07

Question 11

A researcher wanted to formalize the relationship between study time a Statistics subject. The researcher took a random sample of 100 studen

Incorrect

asked each student to report the average amount of time he or she stu mark received. The Table below reports Excel regression output fory = marks out of 100 and x= study time in hours.

Mark 0.00 out of 1.00

Select one: a. The slope coecient is 1.877. b. p-value of the slope coecient is less than 0.01. There is theref favour of a linear relationship between study time and student perfo c. The p-value of the slope coecient is 0 which means there is n time and student performance. d. The slope coecient implies that when a student spends an ad marks go up by 1.877, on average.

The correct answer is: The p-value of the slope coecient is 0 which relationship between study time and student performance.

Question 12

A regression analysis between quantity demanded (y ) and price (x) res The estimated regression equation implies that if price increases by $1

Correct

which of the following?

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Select one: a. Increase by 32 units.

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Question 13

In-Class Exercises Quiz 07

A regression analysis between production costs and overtime hours wo least squares line: ŷ = 56 + 4.8x. What is the slope of the regression line

Correct Mark 1.00 out of

Select one:

1.00

a. $60.8. b. 56. c. 4.8  d. x.

The correct answer is: 4.8

Question 14

An electronics company offers a one-year (12 months) warranty on its if the device is faulty, it will fail within this time period. Suppose that a ra

Incorrect

which have failed found the mean time to failure from purchase was 13 = 3.1 months, what is the p -value associated with testing H0: μ = 12 and signicance level?

Mark 0.00 out of 1.00

 Select one: a. 0.0077. b. 0.4846.  c. 2.1639. d. 0.0154.

The correct answer is: 0.0154.

25/10/2020

In-Class Exercises Quiz 07

Question 15

A box of nails is labelled as containing 1.2 kilograms of the item. Suppo whether the average weight of nails in a box is less than 1.2 kilograms

Correct

hypothesis should not be rejected. Which of the following is a correct s

Mark 1.00 out of 1.00

Select one: a. The manufacturer should either change the label or add more nails line.

b. There is not enough evidence to conclude that the weight of nails in kilograms. 

c. No conclusions regarding the weight of nails in a box can be drawn

d. The weights in each box must have been recorded incorrectly.

The correct answer is: There is not enough evidence to conclude that the weight of nails in kilograms.

◄ In-Class Exercises Quiz 06

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