Statistics
posted by Matt .
A large furniture store has begun a new ad campaign on local television. Before the campaign, the long term average daily sales were $24,819. A random sample of 40 days during the new ad campaign gave a sample mean daily sale of x(bar)=$25,910 with sample standard deviation s=$1917. Does this indicate that the population mean daily sales is now more than $24,819? Use a 1% level of significance.

Use a onesample ztest.
Ho: µ = 24819 > null hypothesis
Ha: µ > 24819 >alternate hypothesis
z = (sample mean  population mean)/(standard deviation divided by the square root of the sample size)
With your data:
z = (25910  24819)/(1917/√40) = ?
Finish the calculation.
Check a ztable at .01 level of significance for a onetailed test.
If the ztest statistic exceeds the critical value from the ztable, reject the null and conclude µ > 24819. If the ztest statistic does not exceed the critical value from the ztable, do not reject the null.
I hope this will help get you started. 
0.065

Bbccvn
Respond to this Question
Similar Questions

Statistics: Two Sample Population Confidence Inter
Two Sample Population Confidence Interval: Before an intensive TV advertising campaign, the producers of Nike athletic shoes find that 30 of a random sample of 217 upperincome adults were aware of their new leisure shoe line. A second … 
PHI
4. <11{1[2(06)06]}> Reporter: A new campaign finance reform bill being considered by Congress would limit the amount of campaign contributions that political candidates can receive. However, a survey of candidates running for … 
Logic Research
A new campaign finance reform bill being considered by Congress would limit the amount of campaign contributions that political candidates can receive. However, a survey of candidates runing for mayor, governor, and senate seats shows … 
government
Most presidential campaign money during the general election is spent on: A. maintaining a campaign staff. B. television advertising. C. mass mailing of campaign literature. D. staging of personal appearances. I THINK IT'S B 
Statistics
A large furniture store has begun a new ad campaign on local television. Before the campaign, the long term mean daily sales were $24,819. A random sample of 40 days during the new ad campaign gave a sample mean daily sale of $25,910. … 
statistics
a sales manager wants to know whether a special promotional campaign is a success. he had the following dataRetail outlets :1 2 3 4 5 6 ; Sales before campaign : 50 48 31 42 28 53 ; Sales after campaign : 56 55 30 45 29 58. Test at … 
critical t hinking
Reporter: A new campaign finance reform bill being considered by Congress would limit the amount of campaign contributions that political candidates can receive. However, a survey of candidates running for mayor, governor, and senate … 
logic
Reporter: A new campaign finance reform bill being considered by Congress would limit the amount of campaign contributions that political candidates can receive. However, a survey of candidates running for mayor, governor, and senate … 
statistics
1)According to past record the average daily sales for a sporting goods store was $3456.00. After a new advertising campaign, the manager wants to see if the average daily sales have changed. A random sample of 20 days gives a sample … 
STAT
You have been hired as a consultant for a company that would like to start a new marketing campaign to increase their online sales. They have given you data for 840 of their customers and would like to know who they should target in …