The police department of a city reports that the mean number of car thefts per neighbourhood per year is 6.1 with a stan

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The Police Department Of A City Reports That The Mean Number Of Car Thefts Per Neighbourhood Per Year Is 6 1 With A Stan 1 (56.95 KiB) Viewed 28 times

The police department of a city reports that the mean number of car thefts per neighbourhood per year is 6.1 with a standard deviation of 1.8. As the mayor of a suburban community just outside the city you are interested in how your community compares. The mean for a random sample of 30 neighbourhoods in your community is 5.5. You want demonstrate that the the crime rate in your community is lower than the crime rate in the city, in other words that ' < 6.1, where u' is the mean for your community. a) Calculate the appropriate test statistic for your sample. b) Using a significance level of 5%, what would the critical value be for this hypothesis test? c) Should you reject or keep the null hypothesis in this test? Answer 0 to keep it and 1 to reject it.