Question

If the variance of the water temperature in a lake is 25° , how many days...

If the variance of the water temperature in a lake is

25°

, how many days should the researcher select to measure the temperature to estimate the true mean within

3°

with

99%

confidence? Round the intermediate calculations to two decimal places and round up your final answer to the next whole number.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.005))" to find the Z-value.

Round to the next whole number.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
If the variance of the water temperature in a lake is 28 degrees how many days...
If the variance of the water temperature in a lake is 28 degrees how many days should the researcher select to measure the temperature to estimate the true mean within 3 degrees with 90% confidence? Round the intermediate calculations to two decimal places and round up your final answer to the next whole number. The researcher needs at least how many day?
If the variance of the water temperature in a lake is 25°, how many days should...
If the variance of the water temperature in a lake is 25°, how many days should the researcher select to measure the temperature to estimate the true mean within 2° with 90% confidence?  
You need to estimate the mean number of travel days per year for outside salespeople. The...
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 140 days, with a standard deviation of 15 days. If you must estimate the population mean within 3 days, how many outside salespeople should you sample? Use the 99% confidence level. (Round the intermediate calculation to 3 decimal places. Round the final answer to the nearest whole number.)                                    Number of outside salespeople           
You need to estimate the mean number of travel days per year for outside salespeople. The...
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 140 days, with a standard deviation of 11 days. If you must estimate the population mean within 4 days, how many outside salespeople should you sample? Use the 99% confidence level. (Round the intermediate calculation to 3 decimal places. Round the final answer to the nearest whole number.)                                    Number of outside salespeople           
You wish to estimate the mean number of travel days per year for salespeople. The mean...
You wish to estimate the mean number of travel days per year for salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 42 days. If you want to estimate the population mean within 6 days, how many salespeople should you sample? Use the 99% confidence level. (Use z Distribution Table.) (Round up your answer to the next whole number.)
You need to estimate the mean number of travel days per year for outside salespeople. The...
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 160 days, with a standard deviation of 19 days. If you must estimate the population mean within 2 days, how many outside salespeople should you sample? Use the 98% confidence level. (Round the intermediate calculation to 3 decimal places. Round the final answer to the nearest whole number.) Number of outside salespeople
A researcher wishes to estimate the average number of minutes per day a person spends on...
A researcher wishes to estimate the average number of minutes per day a person spends on the Internet. How large a sample must she select if she wishes to be 99% confident that the population mean is within 10 minutes of the sample mean? Assume the population standard deviation is 42 minutes. Round your final answer up to the next whole number
For budgetary purposes, a manufacturing company needs to estimate the proportion of defective parts that a...
For budgetary purposes, a manufacturing company needs to estimate the proportion of defective parts that a production process will create. What (minimum) sample size is needed to form a 98% confidence interval to estimate the true proportion of defective parts to within ± 0.04? Do not round intermediate calculations. Round up your final answer to the next whole number. Sample size =  parts
Direct Satellite Television It is believed that 25% of U.S. homes have a direct satellite television...
Direct Satellite Television It is believed that 25% of U.S. homes have a direct satellite television receiver. Round up your final answers to the next whole number. How large a sample is necessary to estimate the true population of homes that have a direct satellite television receiver with 90% confidence and within 3 percentage points?
The President of the Student Affairs Office wants to estimate the percentage of students who favor...
The President of the Student Affairs Office wants to estimate the percentage of students who favor a new student conduct policy. What (minimum) sample size is needed to form an 80% confidence interval to estimate the true percentage of students who favor the policy to within ± 3%? Do not round intermediate calculations. Round up your final answer to the next whole number. Sample size =  students
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT