Entries by Grace Wahito

Determine the minimum sample size required when you want to be 98% confident that the sample mean is within two

February 27, 2020 in /by

Determine the minimum sample size required when you want to be 98% confident that the sample mean is within two units of the population mean. Assume a standard deviation of 5.75 in a normally distributed population. 44 43 23 45  Determine the minimum sample size required when you want to be 80% confident that the […]

 

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A company claims that its heaters last more than 5 years

February 27, 2020 in /by

A company claims that its heaters last more than 5 years. Write the null and alternative hypotheses and note which is the claim. Ho: μ > 5 (claim), Ha: μ ≤ 5 Ho: μ ≤ 5, Ha: μ < 5 (claim) Ho: μ ≤ 5, Ha: μ > 5 (claim) Ho: μ = 5 (claim), […]

 

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A restaurant claims the customers receive their food in less than 16 minutes

February 27, 2020 in /by

A restaurant claims the customers receive their food in less than 16 minutes. A random sample of 39 customers finds a mean wait time for food to be 15.8 minutes with a standard deviation of 0.7 minutes. At α = 0.04, can you support the organizations’ claim using the test statistic? Claim is the alternative, […]

 

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A used car dealer says that the mean price of a three-year-old sport utility vehicle in good condition is $18,000.

February 27, 2020 in /by

A used car dealer says that the mean price of a three-year-old sport utility vehicle in good condition is $18,000. A random sample of 20 such vehicles has a mean price of $18,450 and a standard deviation of $1050. At α=0.08, can the dealer’s claim be supported? Yes, since the test statistic of 1.92 is […]

 

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