A manufacturing company developed a new type of hollow block that has a mean compressive strength of 8 kilograms with a standard deviation of 0.5 kilogram. A random sample of 50 Iblocks is tested and found to have a mean compressive strength of 7.8 kilograms. Use a 0.01 level of significance. Which of the following best contrádicts the null hypothesis, u = 8 The null hypothesis is:

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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[refer to the previous problem]
A manufacturing company developed a
new type of hollow block that has a
mean compressive strength of 8
kilograms with a standard deviation of
0.5 kilogram. A random sample of 50
Iblocks is tested and found to have a
mean compressive strength of 7.8
kilograms. Use a 0.01 level of
significance.
Which of the following best contrádicts
the null hypothesis, u = 8
The null hypothesis is:
O rejected
O accepted
no decision
O insufficient data
Transcribed Image Text:[refer to the previous problem] A manufacturing company developed a new type of hollow block that has a mean compressive strength of 8 kilograms with a standard deviation of 0.5 kilogram. A random sample of 50 Iblocks is tested and found to have a mean compressive strength of 7.8 kilograms. Use a 0.01 level of significance. Which of the following best contrádicts the null hypothesis, u = 8 The null hypothesis is: O rejected O accepted no decision O insufficient data
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