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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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