Business statics class QUESTION 1 A data set of size n17 and

Business statics class

QUESTION 1

A data set of size n=17 and an alpha =.01 is given. You are asked to determine its CIE. The critical value will be:

2.575

2.8982

2.9208

2.5835

QUESTION 2

A confidence interval of 90% was used to estimate the proportion of customers who buy at least two items during their shopping mall experience. A random sample of 100 customers produced a confidence interval of: 49% +/- 4%. What is the best way to explain the result?

Path: p

Words:0

QUESTION 3

The null hypothesis is rejected if the p value is:

>5

<5

<.05

>-5%

QUESTION 4

The regression equation between years of employment (X) and discount amount % (Y) at the Happy cafeteria is given by:  

Y = 2*X + 5

For how many years you need to be an employee in order to get a 25% discount.

5

10

7

none of the above

QUESTION 5

Mall security estimates that the average daily per-store theft is less than $100, but wants to determine the accuracy of this statistic. The company researcher takes a sample of 81 clerks and finds that mean = 103$ and s = $10.

a. state the hypothesis

b. give the acceptance range for H0, considering a test with alpha = .01

Path: p

Words:0

QUESTION 6

a regression analysis on a set of data (with two variables, X and Y) outcomes a value of r-square = 78.5
What would be the interpretation of this value?

Path: p

Words:0

  

QUESTION 7

When the level of confidence and sample standard deviation remain the same, a confidence interval for a population mean based on a sample of n = 40 will be _____ a confidence interval for a population mean based on a sample of n = 50.

narrower than

wider than

equal to

none

QUESTION 8

A nursing home claims that their patients (n=64) will live more than 10 more years. For a test at alpha=.10 the critical   z value is: __________
Acceptance range is: _______________

Path: p

Words:0

QUESTION 9

If r is not significant

A regression analysis should be done

A regression analysis should never be done

r value doesn\'t influence the regression significance

QUESTION 10

The range of values that the correlation coefficient can take is:

-infinite to +infinite

0% to 100%

-1 to +1

0 to 100

7 points   

QUESTION 11

When you are conducting the t test, the population needs to be approximately normally distributed.

True

False

6 points   

QUESTION 12

The mall has a set of data with employee age (X) and the corresponding number of annual on-the-job-accidents(Y). Analysis on the set finds that the regression equation is Y=100-3X. What is the likely number of accidents for someone aged 30?

97

100

10

none of the above

  

QUESTION 13

consider the following regression equation between Y and X:

Y = 4.622X -100

this equation shows a positive correlation between X and Y

this equation shows a negative correlation between X and Y

The regression equation cannot provide information about the type of correlation that exists between the two variable.

QUESTION 14

A coefficient of correlation equal to -.78 shows

a strong correlation

a weak correlation

a moderate correlation

r value is invalid

QUESTION 15

When the population standard deviation is unknown and the sample size is less than 30, what table value should be used in computing a confidence interval for a mean?

t

chi-square

z

none of the above

		2.575
		2.8982
		2.9208
		2.5835

Solution