The sample size is large enough. The population is normally distributed.     The population standard deviation is known. The margin of error is unknown. (b) Which distribution should be used to find the critical value? (Select the correct answer.) The z-distribution because ? is known. The t-distribution because ? is unknown.     The z-distribution because the sample mean is large enough. The t-distribution because the sample size is small. (c) Construct a 90% confidence interval for the true average commute time. Round your answers to two decimal places. lower limit           upper limit           margin of error

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A:

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A: Answer: From the given data, Population standard deviation (σ) = 0.32 Sample size (n) = 49

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A: Mean=96.8 , Standard deviation=0.61

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A:

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A:

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A:

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A:

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Q: In a large section of a statistics class, the points for the final exam are normally distributed,…

A:

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A:

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A: We have given thatMean() = 238standard deviation() = 67sample size (n) = 33

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.