The Chief of Police of Vice City has noticed an increase in the amount of car thefts in the past few months. In hoping to better understand the root cause of this increase in criminal activity, they randomly select the profiles 10 known offenders from the police database. The ages of the offenders are listed in the following table: 14 14 14 13 13 17 19 19 23 25 Calculate the average age of the car thieves. Round your answer to one decimal.
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PROBLEM 4 Some information about auto theft rates (number of auto thefts per 100,000 population) for a sample of 178 cities in two different years is summarized below. 1985 2005 Mean = 150.32 125.17 Median = 117.17 123.01 Standard Deviation = 12.23 7.01 18. Express this statistical information in words. What changes were there in the overall shape of the distribution of this variable? In central tendency? In dispersion? 40 points
Banhishikha S.
According to researchers, the mean length of imprisonment for motor-vehicle-theft offenders in a nation is 16.2 months. One hundred randomly selected motor-vehicle-theft offenders in a city in the nation had a mean length of imprisonment of 16.7 months. At the 1% significance level, do the data provide sufficient evidence to conclude that the mean length of imprisonment for motor-vehicle-theft offenders in the city differs from the national mean? Assume that the population standard deviation of the lengths of imprisonment for motor-vehicle-theft offenders in the city is 5.0 months. Set up the hypotheses for the one-mean z-test. H0: μ = 16.2 Ha: μ < 16.2 (Type integers or decimals. Do not round.) The test statistic is z = 1.00. (Round to two decimal places as needed.) The P-value is (Round to three decimal places as needed.) the null hypothesis. The data sufficient evidence to conclude that the mean length of imprisonment for motor-vehicle-theft offenders in the city is the mean length of imprisonment for motor-vehicle-theft offenders in the nation.
Sri K.
The highway speeds of 100 cars are summarized in the frequency distribution below. Find the mean of the frequency distribution. Round your answer to one more decimal place than is present in the original data values. Speed (mph) / Cars 30-39 / 20 40-49 / 8 50-59 / 2 60-69 / 17 70-79 / 14 The frequency table below shows the number of days off in a given year for police detectives. Find the standard deviation of the frequency distribution. Round your answer to one more decimal place than is present in the original data values. Days Off / Frequency 0-2 / 10 3-5 / 1 6-8 / 4 9-11 / 2 12-14 / 2 15-17 / 5
Sheryl E.
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