Provide an appropriate response. The number of violent crimes committed in a day possesses a distribution with a mean of 3.3 crimes per day and a standard deviation of 5 crimes per day. A random sample of 100 days was observed, and the mean number of crimes for the sample was calculated. Describe the sampling distribution of the sample mean. shape unknown with mean = 3.3 and standard deviation = 0.5 approximately normal with mean = 3.3 and standard deviation = 0.5 shape unknown with mean = 3.3 and standard deviation = 5 approximately normal with mean = 3.3 and standard deviation = 5
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The number of violent crimes committed in a day possesses a distribution with a mean of 4.9 crimes per day and a standard deviation of 4 crimes per day. A random sample of 100 days was observed, and the mean number of crimes for the sample was calculated. Describe the sampling distribution of the sample mean. approximately normal with mean = 4.9 and standard deviation = 0.4 shape unknown with mean = 4.9 and standard deviation = 4 shape unknown with mean = 4.9 and standard deviation = 0.4 approximately normal with mean = 4.9 and standard deviation = 4
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2. The number of violent crimes committed in a day possesses a distribution with a mean of 2.8 crimes per day and a standard deviation of 4 crimes per day. A random sample of 100 days was observed, and the sample mean number of crimes for the sample was calculated. Describe the sampling distribution of the sample means. (5 points) a.) shape unknown with mean of 2.8 and a standard deviation of 0.4 b.) approximately normal with mean of 2.8 and standard deviation of 4 c.) shape unknown with mean of 2.8 and standard deviation of 4 d.) approximately normal with mean of 2.8 and standard deviation of 0.
Anas V.
Use the following information to answer the next seven exercises: Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study was then done to see if the mean time has increased in the new century. A random sample of 26 first-time convicted burglars in a recent year was picked. The mean length of time in jail from the survey was three years with a standard deviation of 1.8 years. Suppose that it is somehow known that the population standard deviation is 1.5. Conduct a hypothesis test to determine if the mean length of jail time has increased. Assume the distribution of the jail times is approximately normal. Is this a test of means or proportions?
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