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A recent national study of crime reported that the average age of a murder victims is...
Is the national crime rate really going down? Some sociologists say yes! They say that the...
Is the national crime rate really going down? Some sociologists say yes! They say that the reason for the decline in crime rates in the 1980s and 1990s is demographics. It seems that the population is aging, and older people commit fewer crimes. According to the FBI and the Justice Department, 70% of all arrests are of males aged 15 to 34 yearst. Suppose you are a sociologist in Rock Springs, Wyoming, and a random sample of police files showed...
Although older Americans are most afraid of crime, it is young people who are more likely to be t...
Although older Americans are most afraid of crime, it is young people who are more likely to be the actual victims of crime. It seems that older people are more cautious about the people with whom they associate. A national survey showed that 10% of all people ages 16-19 have been victims of crime.† At Jefferson High School, a random sample of n = 66 students (ages 16-19) showed that r = 9 had been victims of a crime. Note:...
13: A national survey found that the average number of banking services used was 4.1 per...
13: A national survey found that the average number of banking services used was 4.1 per month. An Analyst for the Malco State Bank sampled its customers, and generated the following output for a one sample test in Data Analysis. If a=.05, do the customers at Malce State Bank use banking services more than the national average of 4.1 times per month? Sample Hypothesized mean 4.1 5.026 4.736 Mean Variance Observations df t Stat P(TC=t) one-tail t Critical one-tail P(TC=t)...
A random sample of n = 10 regions in New England gave the following violent crime...
A random sample of n = 10 regions in New England gave the following violent crime rates (per million population). x New England Crime Rate 3.3 3.7 4.2 3.9 3.3 4.1 1.8 4.8 2.9 3.1 Another random sample of n = 12 regions in the Rocky Mountain states gave the following violent crime rates (per million population). x, Rocky Mountain Crime Rate 3.7 4.1 4.7 5.1 3.3 4.8 3.5 2.4 3.1 3.5 5.2 2.8 Assume that the crime rate distribution...
A May 8, 2008, report on National Public Radio (www.npr.org) noted that the average age of...
A May 8, 2008, report on National Public Radio (www.npr.org) noted that the average age of first- time mothers in the United States is slightly higher than 25 years. Suppose that a recently taken random sample of 57 first-time mothers from Missouri produced an average age of 23.90 years and that the population standard deviation is known to be 4.80 years. a. Find the p-value for the test of hypothesis with the alternative hypothesis that the current mean age of...
13: A national survey found that the average number of banking services used was 4.1 per...
13: A national survey found that the average number of banking services used was 4.1 per month. An Analyst for the Maleo State Bank sampled its customers, and generated the following output for a one sample test in Data Analysis. Ifa - 05, do the customers at Malco State Bank use banking services more than the national average of 4.1 times per month? Hypothesized mean 4.1 Mean Variance Observations df Stat P(T<t) one-tail t Critical one-tail PIT<t) two-tail t Critical...
In a previous poll, 36% of adults with children under the age of 18 reported that...
In a previous poll, 36% of adults with children under the age of 18 reported that their family ate dinner together seven nights a week. Suppose that, in a more recent poll, 378 of 1108 adults with children under the age of 18 reported that their family ate dinner together seven nights a week. Is there sufficient evidence that the proportion of families with children under the age of 18 who eat dinner together seven nights a week has decreased?...
Several years ago, the mean height of women 20 years of age or older was 63.7...
Several years ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 63.9 inches. (a) State the appropriate null and alternative hypotheses to assess whether women are taller today (b) Suppose the P-value for this test is 0.12. Explain what this value represents. (C) Write a conclusion for this hypothesis test assuming...
Assume a normal distribution and use a hypothesis test to test the given claim According to...
Assume a normal distribution and use a hypothesis test to test the given claim According to city reports, it was found that the mean age of the prison population in the city was 26 years. He obtains a random samplo of 25 prisoners and finds a mean age of 24.4 years and a standard 20. years. Marc wants to test the claim that the mean age of the prison population in his city is less than 26 deviation of 9.2...
A national magazine stated that at most, 20% of millennials have a pool membership. Formulate an...
A national magazine stated that at most, 20% of millennials have a pool membership. Formulate an appropriate one-sample test of hypothesis to test this. Determine the null hypothesis, Ho, and the alternative hypothesis, H. Ho H (Type whole numbers.) A bank found that in recent years, the average monthly charge on its credit card was $1,350. With an improving economy, they suspect that this amount has increased. A sample of 45 customers resulted in an average monthly charge of $1,375.09...
Is the national crime rate really going down? Some sociologists say yes! They say that the reason for the decline in crime rates in the 1980s and 1990s is demographics. It seems that the population is aging, and older people commit fewer crimes. According to the FBI and the Justice Department, 70% of all arrests are of males aged 15 to 34 yearst. Suppose you are a sociologist in Rock Springs, Wyoming, and a random sample of police files showed...
13: A national survey found that the average number of banking services used was 4.1 per month. An Analyst for the Malco State Bank sampled its customers, and generated the following output for a one sample test in Data Analysis. If a=.05, do the customers at Malce State Bank use banking services more than the national average of 4.1 times per month? Sample Hypothesized mean 4.1 5.026 4.736 Mean Variance Observations df t Stat P(TC=t) one-tail t Critical one-tail P(TC=t)...
A random sample of n = 10 regions in New England gave the following violent crime rates (per million population). x New England Crime Rate 3.3 3.7 4.2 3.9 3.3 4.1 1.8 4.8 2.9 3.1 Another random sample of n = 12 regions in the Rocky Mountain states gave the following violent crime rates (per million population). x, Rocky Mountain Crime Rate 3.7 4.1 4.7 5.1 3.3 4.8 3.5 2.4 3.1 3.5 5.2 2.8 Assume that the crime rate distribution...
13: A national survey found that the average number of banking services used was 4.1 per month. An Analyst for the Maleo State Bank sampled its customers, and generated the following output for a one sample test in Data Analysis. Ifa - 05, do the customers at Malco State Bank use banking services more than the national average of 4.1 times per month? Hypothesized mean 4.1 Mean Variance Observations df Stat P(T<t) one-tail t Critical one-tail PIT<t) two-tail t Critical...
In a previous poll, 36% of adults with children under the age of 18 reported that their family ate dinner together seven nights a week. Suppose that, in a more recent poll, 378 of 1108 adults with children under the age of 18 reported that their family ate dinner together seven nights a week. Is there sufficient evidence that the proportion of families with children under the age of 18 who eat dinner together seven nights a week has decreased?...
Several years ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 63.9 inches. (a) State the appropriate null and alternative hypotheses to assess whether women are taller today (b) Suppose the P-value for this test is 0.12. Explain what this value represents. (C) Write a conclusion for this hypothesis test assuming...
Assume a normal distribution and use a hypothesis test to test the given claim According to city reports, it was found that the mean age of the prison population in the city was 26 years. He obtains a random samplo of 25 prisoners and finds a mean age of 24.4 years and a standard 20. years. Marc wants to test the claim that the mean age of the prison population in his city is less than 26 deviation of 9.2...
A national magazine stated that at most, 20% of millennials have a pool membership. Formulate an appropriate one-sample test of hypothesis to test this. Determine the null hypothesis, Ho, and the alternative hypothesis, H. Ho H (Type whole numbers.) A bank found that in recent years, the average monthly charge on its credit card was $1,350. With an improving economy, they suspect that this amount has increased. A sample of 45 customers resulted in an average monthly charge of $1,375.09...
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