Entries by Grace Wahito

A researcher wishes to​ estimate, with 95% ​confidence

March 25, 2020 in /by

A researcher wishes to​ estimate, with 95% ​confidence, the population proportion of adults who are confident with their​ country’s banking system. His estimate must be accurate within 5% of the population proportion. ​(a) No preliminary estimate is available. Find the minimum sample size needed. ​(b) Find the minimum sample size​ needed, using a prior study that […]

 

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In a random sample of 28 ​people, the mean commute time to work was 33.2

March 25, 2020 in /by

In a random sample of 28 ​people, the mean commute time to work was 33.2 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a​ t-distribution to construct a 95​% confidence interval for the population mean mu. What is the margin of error of mu? Interpret the results.   Looking for a […]

 

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Construct the confidence interval for the population mean mu. c =

March 25, 2020 in /by

Construct the confidence interval for the population mean mu. c =  style=”background-color:transparent;”>0.90​, x =15.5, sigma = 9.0​, and n = 55 A 90​% confidence interval for mu is ?   Looking for a Similar Assignment? Order now and Get 10% Discount! Use Coupon Code “Newclient”

 

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A vending machine dispenses coffee into a twelve-ounce cup.

March 25, 2020 in /by

A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.05 ounce. You can allow the cup to overfill 1% of the time. What amount should you set as the mean amount of coffee to be​ dispensed?   Looking for a […]

 

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