Hello please help!! I got them wrong, please and thank you!!

part 1

(1 point) 50 people are randomly selected and the accuracy of their wristwatches is checked, with positive errors representing watches that are ahead of the correct time and negative errors representing watches that are behind the correct time. The 50 values have a mean of 93 sec and a population standard deviation of 2415ec. Use a 0.02 significance level to test the claim that the population of all watches has a mean of Osec (use a two-sided alternative). The test statistic is The P-Value is The final conclustion is O A. There is sufficient evidence to warrant rejection of the claim that the mean is equal to 0 O B. There is not sufficient evidence to warrant rejection of the claim that the mean is equal to O The data below gives the mean price (in cents) of a litre of regular gasoline at self-service filling stations at a sample of six urban centres in Canada in May 2012. Urban area Price/litre St. John, NL 135 Quebec 136.9 Toronto 128.9 Calgary 1 14.5 Victoria 131.8 Whitehorse 136.5 Provide answers to the following to two decimal places. Part (a) Find the sample mean (in cents). Part (b) Find the sample standard deviation (in cents). Part (C) Using the appropriate t distribution, find a 90% confidence interval for the mean gasoline price per litre across urban Canada in May 2012. Provide the upper and lower bounds for your confidence interval. ( . ) Part (d) Would a 95% confidence interval be wider or narrower than the interval you found in Part (c)? Using the appropriate t distribution, find a 95% confidence interval for the mean gasoline price per litre across urban Canada in May 2012. Provide the upper and lower bounds for your confidence interval. ( . )