Question

A sample of 18 small bags of the same brand of candies was
selected. Assume that the population distribution of bag weights is
normal. The weight of each bag was then recorded. The mean weight
was 3 ounces with a standard deviation of 0.12 ounces. The
population standard deviation is known to be 0.1 ounce.

NOTE: If you are using a Student's *t*-distribution, you may
assume that the underlying population is normally distributed. (In
general, you must first prove that assumption, though.)

Construct a 98% confidence interval for the population mean weight of the candies.

(i) State the confidence interval. (Round your answers to three decimal places.)

(ii) Sketch the graph.

(iii) Calculate the error bound. (Round your answer to three decimal places.)

Answer #1

i) At 98% confidence level, the critical value is
z_{0.01} = 2.33

The 98% confidence interval is

ii)

iii) Margin of error is

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a) (8 points) Construct a 90% confidence interval for the
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b) (2 points) Explain in a complete sentence...

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total
89
90
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LicenseQuestion 18. Points possible: 1 Unlimited attempts. Post
this question to forum Incorrect but can retry You measure 50
textbooks' weights, and find they have a mean weight of 75...

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