A local change business claims that the mean waiting time for customers is 20 minutes or less. The quality assurance department found in a sample of 24 customers that the mean waiting time was. 22.75 minutes with a standard deviation of 8.25 minutes. At the 0.05 level of significance. Can we conclude that the claim is wrong?a) state the null and alternative hypotheses b) is this a one-tailed or two-tailed hypothesis text?c) find the critical value d) calculate the test statistic e)what is your decision in regards to the null hypothesis?

The owner of a retail store randomly selected weekly data on profits and advertising cost and asked a statistics stud Excel output is shown below: SUMMARY OUTPUT Regression Statistics Multiple R 0.9562 R Square 0.9336 Adjusted R Square 0.9115 Standard Error 23.9274 Observations 5 Coefficients | Standard Error t Stat P-value Lower 95% Upper 95% Intercept 210.068 17.865 11.759 0.0013 153.2146 266.9206 Advertising Cost 0.808 0.124 6.496 0.0074 0.4122 1.2040 a) What is the correlation between advertising costs and profits