You suspect that your favorite candy bar manufacturer’s eight-ounce candy bars w

Question

You suspect that your favorite candy bar manufacturer’s eight-ounce candy bars weigh less than advertised. You go out and buy 200 candy bars from different stores. You find that their average weight is 7.75 ounces, with a standard deviation of 0.5 ounces. Do you have enough evidence to believe that you are being shortchanged? Significance level (a=0.05)


1.What is the null hypothesis for this question?
Answer


Ha: µH == 8.0

H0: µH = 7.75

Ha: µH < 8.0

H0: µH =8.0

Ha: µH =8.0

o Question 3


What is the alternative hypothesis for this question?
Answer


Ha: µH == 8.0

H0: µH =8.0

H0: µH = 7.75

Ha: µH < 8.0

Ha: µH =8.0


Question 4
Question 4
1.

What is the value of standard error of the mean? _____ (x.xx)
Answer


1 points
Question 5
Question 5
1.

What is the calculated t value for this question?------( xx.xx )
Answer

Question 6
1.

What is the critical t value for this question? X.xx (find it from t table first then decide the sign of the critical t value for this answer)
Answer


Question 7
Question 7
1.

Using the significane level of 0.05, what is the decision making for this hypothesis test?
Answer


Accept H0

Reject H0


Question 8
1.

What is the conclusion for this question?
Answer


The sample mean is significantly different from the population mean.

The sample mean is significantly lighter than the population mean.

no answer

The sample mean is significantly heavier than the population mean.

The sample mean is equal to the population mean.

Question 9
1.

If the result of the average weight of the candy bars (7.75) with standard deviation of 0.5 is from a sample size of 10, the calculated t value will become x.xx
Answer



Question 10
Question 10
1.

If the result of the average weight of the candy bars (7.75) with standard deviation of 0.5 is from a sample size of 10, the critical t value for this question is _______ (x.xx) (find it from t table find it from t table first then decide the sign of the critical t value for this question)
Answer


1 Question 11
1.

If the result of the average weight of the candy bars (7.75) with standard deviation of 0.5 is from a sample size of 10, the decision making of the hypothesis test is ______
Answer


Reject H0

Accept H0

Question 12
1.

If the result of the average weight of the candy bars (7.75) with standard deviation of 0.5 is from a sample size of 10, what is the lower limit of the 95% confidence interval of the candy bars? ____ (x.xx)
Answer



Question 13
1.

If the result of the average weight of the candy bars (7.75) with standard deviation of 0.5 is from a sample size of 10, what is the upper limit of the 95% confidence interval of the candy bars? ____ (x.xx)
Answer

Explanation / Answer

H0: µH =8.0 H0 you always believe them Ha: µH < 8.0 one tailed because you believe less Standard error: s/sqrt(n)=.5/sqrt(200) t score: (observed-expected)/Standard error (7.75-8)/(.5/sqrt(200))=-7.07106781 Reject H0 The sample mean is significantly lighter than the population mean. 10. (7.75 - 8) / (.5 / sqrt(10)) = -1.58113883 11. Accept H0 12. 7.75-2.262*.5/sqrt(10)=7.3923464 13. 7.75 + ((2.26200 * .5) / sqrt(10)) = 8.1076536

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