Entries by Hannah Wangui

A sample mean, sample size, and population standard deviation are given. Use the one-mean z-test to perform the required hypothesis test at the given significance level. Use the critical -value approach.

December 4, 2020 in /by

A sample mean, sample size, and population standard deviation are given. Use the one-mean z-test to perform the required hypothesis test at the given significance level. Use the critical -value approach. = 25, n = 40, σ = 1.5, H0: μ = 23; Ha: μ ≠ 23, α = 0.05 z = 8.43; critical values = ±1.96; reject H0 z = 8.43; critical values = ±1.645; reject H0 z = 8.43; critical values = ±1.645; do not reject H0 z = 8.43; critical values = ±1.96; do not […]

 

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 Identify the type of study proposed and indicate its specific strengths and weaknesses.

December 4, 2020 in /by

An investigator wants to assess whether smoking is a risk factor for pancreatic cancer. Electronic medical records at a local hospital will be used to identify fifty patients with pancreatic cancer. One hundred patients who are similar but free of pancreatic cancer will also be selected. Each participant’s medical record will be analyzed for smoking history. Identify the […]

 

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probability

December 4, 2020 in /by

Step A: Average time 5 minutes, stdev = 1.2 minutesStep B: Average time 9 minutes, stdev = 0.9 minutes Step C: Average time 11 minutes, stdev = 2.1 minutes Given the above data on a three-stage production process, what is the probability step C takes longer than step B?   Looking for a Similar Assignment? […]

 

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Use the t-distribution to find a confidence interval for a mean μ

December 4, 2020 in /by

1.Use the t-distribution to find a confidence interval for a mean μ given the relevant sample results. Give the best point estimate for μ, the margin of error, and the confidence interval. Assume the results come from a random sample from a population that is approximately normally distributed. A 90% confidence interval for μ using the sample results x¯=137.0, s=56.2, and n=50 Round your […]

 

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