How big is the minimum required sample size that would

Assignment Help Basic Statistics

Reference no: EM13633821

Can you please help with this question? Thank you!

You want to determine the average number of hours worked by professors at your university per week. You want to be able to express your answer as a confidence interval, with 95% confidence (that is, use z = 1.96) and you are aiming for a precision of plus or minus two hours. Past studies of this type suggest that the variance in professor work hours is about 100 (that is, ?² = 100).

a. How big is the minimum required sample size that would allow you to meet your confidence and precision goals?

b. If you wanted your precision to double (that is, your precision would be plus or minus one hour), how does that affect your minimum required sample size?

c. If you wanted your confidence to increase to 99% (That is, use z = 2.575 instead of 1.96), how does that affect your minimum required sample size?

Reference no: EM13633821

Questions Cloud

Calculate the gibbs free energy of the eutectic melt : gold and silicon are mutually insoluble in the solid state and form a eutectic system with at eutectic temperature of

Reginald brown an inspector from the department of weights : reginald brown an inspector from the department of weights and measures weights 15 eighteen ounce cereal boxes of corn

The heat of combustion of methane a component of natural : the heat of combustion of methane a component of natural gas is212 kcalmol. that of propane a component of lp gas

Alan leaves los angeles at 800 am to drive to san fransisco : alan leaves los angeles at 800 am to drive to san fransisco 400 mi away. he travels at a steady 50mph. beth leaves los

How big is the minimum required sample size that would : can you please help with this question? thank youyou want to determine the average number of hours worked by professors

Acetylene has a pka of25 calculate the ka the pka of phenol : acetylene has a pka of25. calculate the ka. the pka of phenol is 9.9. which isthestronger acid acetylene or phenol?

A thermocouple outputs a voltage that is linearyl : a thermocouple outputs a voltage that is linearyl proportional to temperature. it is used to measure an input signal

For each of the situations described state whether the : for each of the situations described state whether the sampling procedure is simple random sampling stratified random

A gas has a volume of 4500 ml if the temperature is held : a gas has a volume of 450.0 ml. if the temperature is held constant what volume would the gas occupy if the pressure

User Account

All Pages