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Sales at a fast-food restaurant average $6,000 per day. The restaurant decided to introduce an advertising campaign to increase daily sales. To determine the effectiveness of the advertising campaign, a sample of 49 days of sales were taken. They found that the average daily sales were $6,300 per day. From past history, the restaurant knew that its population standard deviation is about $1,000. The restaurant wishes to test whether sales have increased as a result of the advertising campaign. If the level of significance is 0.05, what is the decision? Select one: O a. Fail to reject the null hypothesis. O b. Reject the null hypothesis and conclude the mean is lower than $6,000 per day. O c. Reject the null hypothesis and conclude that the mean is equal to $6,000 per day. O d. Reject the null hypothesis and conclude the mean is higher than $6,000 per day