Suppose that an accounting firm does a study to determine the time needed to complete one...

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Suppose that an accounting firm does a study to determine the time needed to complete one...

Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 175 people. The sample average is 23.2 hours. There is a known population standard deviation of 6.6 hours. The population distribution is assumed to be normal.

1. x =

σ =

σ _x = (rounded to three decimal places)
n =

n − 1 =

2.Construct a 90% confidence interval for the population average time to complete the tax forms.

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

(ii) Sketch the graph.

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

math Statistics-And-Probability

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Answer 1

Answer #1

$Date x Given Sample si2e (n) 15 ann ample rRa pop $0 y, confidence level atre \oy, then ZAp 1.64 23.2 40499 23.2 the 2:38 2:$

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Answer 2

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