Assignment: Set 3.3: z Test

Assignment: Set 3.3: z Test
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?