15. please show all work for this problem and round as far as possible

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Previously, an organization reported that teenagers spent 1.5 hours per day, on average, on the phone. However, now the organization thinks that, the mean is higher. 50 randomly chosen teenagers were asked how many hours per day they spend on the phone. The sample mean was 1.45 hours with a sample standard deviation of 0.3. Conduct a test using a significance level of a=0.05 (a) The test statistic (b) The critical value (c) The final conclusion is A. There is enough evidence to say that teenager spend more time on the phone. B. There is not sufficient evidence to show that teenager spend more time on the phone.