# Assignment: Set 3.3: z Test

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# Assignment: Set 3.3: z Test

Assignment: Set 3.3: z Test

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Assignment: Set 3.3: z Test
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• Criterion: Calculate a      z test to make a decision about      a sample.
• Data: The average      (mean) height for adult women is 65 inches, and the standard deviation is      3.5 inches. Given the women you know, you think this number is low; so,      you record the heights of 25 of your female friends. The average height of      your 25 friends is 66.84 inches.

Portion of the Normal Curve Table

z

Area

z

Area

z

Area

z

Area

1.92

.9726

2.27

.9884

2.62

.9956

2.97

.9985

1.93

.9732

2.28

.9887

2.63

.9957

2.98

.9986

1.94

.9738

2.29

.9890

2.64

.9959

2.99

.9986

• Instruction: Answer this:      If your friends are just a representative sample of adult females,      what is the probability that your friends are so tall?
• Criterion: Calculate a      z test to make a decision about      a sample.
• Data: The average      (mean) height for adult women is 65 inches, and the standard deviation is      3.5 inches. Given the women you know, you think this number is low; so,      you record the heights of 25 of your female friends. The average height of      your 25 friends is 66.84 inches.

Portion of the Normal Curve Table

z

Area

z

Area

z

Area

z

Area

1.92

.9726

2.27

.9884

2.62

.9956

2.97

.9985

1.93

.9732

2.28

.9887

2.63

.9957

2.98

.9986

1.94

.9738

2.29

.9890

2.64

.9959

2.99

.9986

• Instruction: Answer this:      If your friends are just a representative sample of adult females,      what is the probability that your friends are so tall?
• Criterion: Calculate a      z test to make a decision about      a sample.
• Data: The average      (mean) height for adult women is 65 inches, and the standard deviation is      3.5 inches. Given the women you know, you think this number is low; so,      you record the heights of 25 of your female friends. The average height of      your 25 friends is 66.84 inches.

Portion of the Normal Curve Table

z

Area

z

Area

z

Area

z

Area

1.92

.9726

2.27

.9884

2.62

.9956

2.97

.9985

1.93

.9732

2.28

.9887

2.63

.9957

2.98

.9986

1.94

.9738

2.29

.9890

2.64

.9959

2.99

.9986

• Instruction: Answer this:      If your friends are just a representative sample of adult females,      what is the probability that your friends are so tall?
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