a researcher is interested in estimating the average salary of fire fighters

5. a researcher is interested in estimating the average salary of fire fighters in a large city. he wants to be 95% confident that his estimate is correct. if the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200? 6. a researcher claims that the average age of people who buy lottery tickets is 70. a sample of 30 is selected and their ages are recorded as shown below. the standard deviation is 16.at alpha = 0.05 is their enough evidence to reject the researchers claim? 49|63|90|52|22|80|72|56|82|56 24|46|70|74|70|61|65|71|39|74 79|76|71|49|62|68|71|67|69|45 7. a sample size of 35 is used to test Ho!m>65 vs.Ho!H given that x = 63.5 and o = 2.5, answer the following a)what is the computer value of the test statistic?, b)what distribution does the test statistic have when the null hypothesis is true?, c)is the alternative hypothesis one-tailed or two-tailed, d)what is the p-value? the x has 2 lines over it. 8. list the steps involved in hypothesis testing using a)the traditional classical method, b)the probability-value method. Provide and exampl;e of each.