Homework Answers
f) we are 99% confident that
proportion of driver fatalities related to alcohol is not less than
77%
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17. The U.S. Department of Transportation reported that 77% of all fatally injured automobile drivers were...
The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that 77% of all fatally...
The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that 77% of all fatally injured automobile drivers were intoxicated. A random sample of 31 records of automobile driver fatalities in Kit Carson County, Colorado, showed that 18 involved an intoxicated driver. Do these data indicate that the population proportion of driver fatalities related to alcohol is less than 77% in Kit Carson County? Use α = 0.01. Solve the problem using both the traditional method and the P-value...
The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that 77% of all fatally...
The U.S. Department of Transportation, National Highway
Traffic Safety Administration, reported that 77% of all fatally
injured automobile drivers were intoxicated. A random sample of 28
records of automobile driver fatalities in Kit Carson County,
Colorado, showed that 14 involved an intoxicated driver. Do these
data indicate that the population proportion of driver fatalities
related to alcohol is less than 77% in Kit Carson County? Use α =
0.01. Solve the problem using both the traditional method and the
P-value...
The us. Department Transportation National ghway aff c Safety Adr i istration, eported that 77% of...
The us. Department Transportation National ghway aff c Safety Adr i istration, eported that 77% of all at ally i ured auto mo e verswe e nto cated Aranao driver Do these data indicate that the population proportion of driver fatait es related to alcohol is less than 77% in Kit Carson County? Use α-0.10. sample of 55 ecots o autom ble drive a a tesi ace an county showed that 37 in ed an int icated )What is the...
Would you favor spending more federal tax money on the arts? Of a random sample of...
Would you favor spending more federal tax money on the arts? Of a random sample of n = 93 politically conservative voters, 1 = 17 responded yes. Another random sample of n2 = 78 politically moderate voters showed that r2 - 22 responded yes. Does this information indicate that the population proportion of conservative voters inclined to spend more federal tax money on funding the arts is less than the proportion of moderate voters so inclined? Use a = 0.05....
Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of...
Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood). For healthy adults, the mean of the x distribution is μ = 7.4.† A new drug for arthritis has been developed. However, it is thought that this drug may change blood pH. A random sample of 36 patients with arthritis took the drug for 3 months. Blood tests showed that x = 8.7 with sample standard deviation s = 3.4. Use a...
1.) Is the national crime rate really going down? Some sociologists say yes! They say that...
1.) 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 years.† Suppose you are a sociologist in Rock Springs, Wyoming, and a random sample of police files...
The type of household for the U.S. population and for a random sample of 411 households...
The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Type of Household Percent of U.S. Households Observed Number of Households in the Community Married with children 26% 101 Married, no children 29% 118 Single parent 9% 28 One person 25% 97 Other (e.g., roommates, siblings) 11% 67 Use a 5% level of significance to test the claim that the distribution of U.S. households fits the...
The type of household for the U.S. population and for a random sample of 411 households...
The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Type of Household Percent of U.S. Households Observed Number of Households in the Community Married with children 26% 100 Married, no children 29% 118 Single parent 9% 30 One person 25% 93 Other (e.g., roommates, siblings) 11% 70 Use a 5% level of significance to test the claim that the distribution of U.S. households fits the...
The U.S. Office of Personnel Management reports that 51% of federal civilian employees have a bachelor's...
The U.S. Office of Personnel Management reports that 51% of
federal civilian employees have a bachelor's degree or higher
(OPM.gov). A random sample of 106 employees in the private
sector showed that 44 have a bachelor's degree or higher. Does this
indicate that the percentage of employees holding bachelor's
degrees or higher in the private sector is less than in the federal
civilian sector? Use α = 0.05.
What are we testing in this problem?
single meansingle proportion
(a) What...
The type of household for the U.S. population and for a random sample of 411 households...
The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Observed Number of Households in the Community 90 Type of Household Married with children Married, no children Single parent One person Other (e.g., roommates, siblings) Percent of U.S. Households 26% 29% 9% 25% 11% 126 28 100 67 Use a 5% level of significance to test the claim that the distribution of U.S. households fits the...
The U.S. Department of Transportation, National Highway
Traffic Safety Administration, reported that 77% of all fatally
injured automobile drivers were intoxicated. A random sample of 28
records of automobile driver fatalities in Kit Carson County,
Colorado, showed that 14 involved an intoxicated driver. Do these
data indicate that the population proportion of driver fatalities
related to alcohol is less than 77% in Kit Carson County? Use α =
0.01. Solve the problem using both the traditional method and the
P-value...
The us. Department Transportation National ghway aff c Safety Adr i istration, eported that 77% of all at ally i ured auto mo e verswe e nto cated Aranao driver Do these data indicate that the population proportion of driver fatait es related to alcohol is less than 77% in Kit Carson County? Use α-0.10. sample of 55 ecots o autom ble drive a a tesi ace an county showed that 37 in ed an int icated )What is the...
Would you favor spending more federal tax money on the arts? Of a random sample of n = 93 politically conservative voters, 1 = 17 responded yes. Another random sample of n2 = 78 politically moderate voters showed that r2 - 22 responded yes. Does this information indicate that the population proportion of conservative voters inclined to spend more federal tax money on funding the arts is less than the proportion of moderate voters so inclined? Use a = 0.05....
The U.S. Office of Personnel Management reports that 51% of
federal civilian employees have a bachelor's degree or higher
(OPM.gov). A random sample of 106 employees in the private
sector showed that 44 have a bachelor's degree or higher. Does this
indicate that the percentage of employees holding bachelor's
degrees or higher in the private sector is less than in the federal
civilian sector? Use α = 0.05.
What are we testing in this problem?
single meansingle proportion
(a) What...
The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Observed Number of Households in the Community 90 Type of Household Married with children Married, no children Single parent One person Other (e.g., roommates, siblings) Percent of U.S. Households 26% 29% 9% 25% 11% 126 28 100 67 Use a 5% level of significance to test the claim that the distribution of U.S. households fits the...
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