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[answered] BAD 2323 Ch11 Hwk Ex 11-1 n p #1 400 0.48 #2 300 0.36 a. Po


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BAD 2323 Ch11 Hwk Ex 11-1

 

n

 

p #1

 

400

 

0.48 #2

 

300

 

0.36 a. Point estimate of difference between the 2

 

population proportions? b. 90% confidence interval: c. 95% confidence interval: Ex 11-2

 

n

 

p #1

 

200

 

0.22 #2

 

300

 

0.16 Ho: p1 - p2 =0

 

Alpha risk = .10 / 2 two tail

 

Calculate Pooled Ppool =

 

Calculate Standard Error=

 

Calculate Table Zt =

 

Calculate Computed Zc =

 

Accept or Reject Ho? Ex 3 yes Yes

 

No

 

Total

 

p Ho: p1-p2=0

 

Alpha = .05 / 2

 

Two tailed Test

 

at95% ci

 

Calculate Pooled Ppool =

 

Calculate Standard Error=

 

Calculate Table Zt =

 

Calculate Computed Zc = M

 

255

 

45

 

300

 

0.85 W

 

279

 

21

 

300

 

0.93 Accept or reject Ho?

 

95% confidence interval= Ex 4 Survey was taken of men and women.

 

The firm conducting the survey is testing the

 

Ho that there is no significant difference between

 

the percentage of men and the percentage of

 

women who responded to the survey.

 

M

 

W

 

Co-op

 

110

 

210

 

Not

 

90

 

90

 

Total

 

200

 

300

 

Co-op

 

p

 

0.55

 

0.70 Ho: Pm = Pw; Pm - Pw = 0

 

Alpha = .05 / 2 two tail test

 

Calculate Pooled Ppool =

 

Calculate Standard Error=

 

Calculate Table Zt =

 

Calculate Computed Zc =

 

Accept or reject Ho?

 

95% confidence interval= Ex 6 A sample of n = 200 was taken for categories

 

A 60, B 120, C 20.

 

Use Chi Square, Alpha of 1% to test the goodness of fit.

 

Ho: pa = .40; pb = .40; pc = .20

 

observed

 

frequency

 

fo

 

a

 

60

 

b

 

120

 

c

 

20

 

Total

 

200 Calculate Table ct2 = Calculate Computed ct2 =

 

Reject or Do not Reject Ho?

 

Ex 7 Survey of n = 748 to determine which type

 

of service was used:

 

Full 264; Discount 255; Both 229

 

Use Chi Square, Alpha of 10% to test the Ho

 

that: There is no significant difference in preference

 

as to the above types of brokerage firms. Calculate Table ct2 =

 

Calculate Computed ct2 =

 

Reject or Do not Reject Ho?

 

Ex 8 A study of n = 135 customers to determine display

 

preferences

 

Display

 

A

 

43

 

B

 

53

 

C

 

39

 

Total

 

135

 

Use Chi Square; Alpha = .05 to test Ho: There is no

 

significant difference in display preferences. Calculate Table ct2 =

 

Calculate Computed ct2 =

 

Reject or Do not Reject Ho?

 

Ex 9 A study of n = 108 men and women was made to

 

determine the preference of Baseball, Basketball, Football.

 

Use Chi Square; Alpha = .05 to test the Ho: There is no significant

 

difference between men and women in preference to 3 sports. m

 

w

 

Total fo

 

Base

 

19

 

16

 

35 fo

 

Bask

 

15

 

18

 

33 fo

 

Foot

 

24

 

16

 

40 Total

 

58

 

50

 

108 Use Chi Square; Alpha = .025 to test Ho: There is no significant

 

difference between Young and Middle ages as to preference of

 

products A, B, C. Calculate Table ct2 =

 

Calculate Computed ct2 =

 

Reject or Do not Reject Ho?

 

Ex 10 The following departments make errors.

 

Use Chi Square: 10% to test the Ho: There is no significant

 

difference in the errors of the departments.

 

Dept

 

Errors

 

A

 

5

 

B

 

4

 

C

 

8

 

D

 

3

 

Total

 

20 Calculate Table ct2 =

 

Calculate Computed ct2 =

 

Reject or Do not Reject Ho?

 


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