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QUESTION 5 Do one of the following, as appropriate: (a) Find the critical value zα/2, (b) find the critical value tα/2, (c) state that neither the normal nor the t distribution applies. 99%; n = 17; σ is unknown; population appears to be normally distributed. a. zα/2 = 2.567 b. zα/2 = 2.583 c. tα/2 = 2.898 d. tα/2 = 2.921 QUESTION 7 Do one of the following, as appropriate: (a) Find the critical value zα/2, (b) find the critical value tα/2, (c) state that neither the normal nor the t distribution applies. 91%; n = 45; σ is known; population appears to be very skewed. a. tα/2 = 1.645 b. zα/2 = 1.75 c. zα/2 = 1.70 d. tα/2 = 1.34 QUESTION 8 Find the margin of error for the 95% confidence interval used to estimate the population proportion. n = 290, x = 100 a. 0.0656 b. 0.0492 c. 0.0547 d. 0.0574 QUESTION 9 Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. n = 105, x = 64; 88 percent a. 0.535 < p < 0.685 b. 0.531 < p < 0.689 c. 0.536 < p < 0.684 d. 0.532 < p < 0.688

          QUESTION 5
Do one of the following, as appropriate: (a) Find the
critical
value zα/2,
(b) find the critical
value tα/2,
(c) state that neither the normal nor the t distribution
applies.
99%; n =  17;   σ  is unknown;
population appears to be normally distributed.
a. zα/2 = 2.567
b. zα/2 = 2.583
c. tα/2 = 2.898
d. tα/2 = 2.921
QUESTION 7
Do one of the following, as appropriate: (a) Find the
critical
value zα/2,
(b) find the critical
value tα/2,
(c) state that neither the normal nor the t distribution
applies.
91%; n =  45;   σ  is known;
population appears to be very skewed.
a. tα/2 = 1.645
b. zα/2 = 1.75
c. zα/2 = 1.70
d. tα/2 = 1.34
QUESTION 8
Find the margin of error for the 95% confidence interval
used to estimate the population proportion.
n =  290, x =  100
a. 0.0656
b. 0.0492
c. 0.0547
d. 0.0574
QUESTION 9
Use the given degree of confidence and sample data to
construct a confidence interval for the population proportion
p.
n =  105, x =  64; 88 percent
a. 0.535 < p < 0.685
b. 0.531 < p < 0.689
c. 0.536 < p < 0.684
d. 0.532 < p < 0.688

Added by Christopher V.

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