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Testing a claim in regards to a mean weight using a confidence level. Complete with a solution diagram.

A flour manufacturer packs flour into paper bags, each of which is supposed to hold 10 pounds, or 160 ounces. Some customers have complained that the bags hold only 9.5 pounds, or 152 ounces. A test is conducted to determine whether the complaint is warranted. The weight of each bag is normally distributed with a Population Standard Deviation of 5 ounces. A sample of 16 bags yields a mean weight of 156 ounces. Shall we reject the null hypothesis of Mean Weight is exactly equal to 160 ounces with a level of significance of .05? Set up the Hypothesis test in "standard form" and then carry out the test.

Subject:

Statistics

Topic:

All Topics

Posting ID:

3588

OTA ID:

101733

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Understanding the types of a hypothesis test.

A Hot Fudge Sundae has on average 12 ounces of ice cream. If I were to set up a hypothesis test to test the ability of a new employee making the hot fudge sundae with an average of 12 ounces of ice cream, would the hypothesis test be a "one tailed" or a "two tailed" test? Briefly Explain.

Subject:

Statistics

Topic:

All Topics

Posting ID:

3590

OTA ID:

101202

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Working with confidence levels.

I randomly selected 200 likely voters and created a 95 percent confidence interval for the true proportion of voters that will vote for my candidate. My confidence interval has endpoints of 0.39 and 0.45. Given the confidence interval that I created, is my candidate going to win? After constructing the confidence interval I called a friend and gave him my results. He interpreted my results as being a 95% chance that the true proportion of voters for our candidate was between 0.39 and 0.45. Was his interpretation correct?

Subject:

Statistics

Topic:

All Topics

Posting ID:

3591

OTA ID:

101327

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Working with hypothesis tests.

If when you do a Hypothesis test about the Population Mean, somehow you have the actual value for the Population Standard Deviation. Suppose that you were able to get a sample of size 100, and did not know the Population Standard Deviation. What can you do to still carry out the Hypothesis test?

Subject:

Statistics

Topic:

All Topics

Posting ID:

3621

OTA ID:

101733

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Testing a claim using a mean weight, standard deviation and confidence levels.

A vendor sells turkeys to a restaurant chain. He claims that the mean weight of the turkeys is more than 15 pounds. A sample of 16 turkeys yields a mean of weight of 14 pounds and a standard deviation of 4 pounds. At a significance level of 0.05 shall we reject the vendor's claim? Set up the Hypothesis test in "standard form" and then carry out the test:
1. Lower limit = M - t*s
2. Upper limit = M + t*s
3. Confidence interval of the mean is (M - t*s, M + t*s)
Finally, if m falls within the interval (M - t*s, M + t*s), we can accept H0; if not, we reject it.

Subject:

Statistics

Topic:

All Topics

Posting ID:

3623

OTA ID:

103058

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