Happy Harvest Bread Company needs to determine whether a new advertising campaign has increased its mean daily income.The daily income for 50 randomly selected business days prior to campaign was recorded.After the advertising campaign, the income for another 30 randomly selected days wasrecorded.Let probability of making a type I error be 1%. Do these data provide sufficient evidence for the management to conclude that the mean income has changed by the advertising campaign?A summary of the results of the two samples is shown below:

Before Campaign

After Campaign

Sample Mean

$5,255

$5,330

Sample Standard Deviation

$215

$238

Sample Size

50

30

1.) Write the null and alternative hypothesis ?

2.) Calculate value of test statistic ?

3.) Calculate critical value ?

4.) What is the conclusion ?