5.48 A Department of Transportation survey showed that 60% of U.S. residents over 65 years of...
5.48 A Department of Transportation survey showed that 60% of U.S. residents over 65 years of age oppose use of cell phones in flight even if there were no issues with the phones interfering with aircraft communications systems. If this information is correct and if a researcher randomly selects 25 U.S.residents who are over 65 years of age, a. What is the probability that exactly 12 oppose the use of cell phones in flight? b. What is the probability that more than 17 oppose the use of cell phones in flight? c. What is the probability that less than eight oppose the use of cell phones in flight? If the researcher actually got less than eight,what might she conclude about the Department of Transportation survey?
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5.48 A Department of Transportation survey showed that 60% of
U.S. residents over 65 years of...
The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the...
The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. At least how many residents do they need to survey if they want to be at least 99% confident that the sample proportion is within 0.04 of the true proportion? Statistical Tables and Charts
A recent independent random survey of 250 people age 65 or older showed 138 of them...
A recent independent random survey of 250 people age 65 or older showed 138 of them employed (either part or full time). Ten years ago, a similar, random independent survey of 300 people age 65 or older found that 142 of them were employed (either part or full time). Use a 1% level of significance to test if the proportion of people age 65 or older who are employed is different than it was 10 years ago and interpret. What...
The Arizona Department of Transportation (ADoT) is considering changing statewide speed limits from 65 mph to...
The Arizona Department of Transportation (ADoT) is considering changing statewide speed limits from 65 mph to 75 mph. They wish to perform analysis on ?, the proportion of Arizona residents that favor this change. In order to prove that a majority of residents favor the change, ADoT wishes to test the following hypotheses using a level of significance of 0.05. H0: ? = 0.5 H1:? > 0.5 ADoT wishes to design the test to have a power of 90% if...
The Arizona Department of Transportation (ADoT) is considering changing statewide speed limits from 65 mph to...
The Arizona Department of Transportation (ADoT) is considering changing statewide speed limits from 65 mph to 75 mph. They wish to perform analysis on ?, the proportion of Arizona residents that favor this change. In order to prove that a majority of residents favor the change, ADoT wishes to test the following hypotheses using a level of significance of 0.05. H0 : p = 0.5 H1 : p > 0.4 ADoT wishes to design the test to have a power...
The Arizona Department of Transportation (ADOT) is considering changing statewide speed limits from 65 mph to...
The Arizona Department of Transportation (ADOT) is considering changing statewide speed limits from 65 mph to 75 mph. They wish to perform analysis on p, the proportion of Arizona residents that favor this change. In order to prove that a majority of residents favor the change, ADOT wishes to test the following hypotheses using a level of significance of 0.05. Ho:p = 0.5 H:p > 0.5 ADOT wishes to design the test to have a power of 90% if the...
The Arizona Department of Transportation (ADOT) is considering changing statewide speed limits from 65 mph to...
The Arizona Department of Transportation (ADOT) is considering changing statewide speed limits from 65 mph to 75 mph. They wish to perform analysis on p, the proportion of Arizona residents that favor this change. In order to prove that a majority of residents favor the change, ADoT wishes to test the following hypotheses using a level of significance of 0.05. Ho:p = 0.5 H1: p > 0.5 ADOT wishes to design the test to have a power of 90% if...
The Bureau of Labor Statistics’ American Time Use Survey showed that the amount of time spent...
The Bureau of Labor Statistics’ American Time Use Survey showed that the amount of time spent using a computer for leisure varied greatly by age. Individuals age 75 and over averaged 0.35 hour (21 minutes) per day using a computer for leisure. Individuals ages 15 to 19 spend 1.1 hour per day using a computer for leisure. If these times follow an exponential distribution, find the proportion of each group that spends: Less than 18 minutes per day using a...
17. The U.S. Department of Transportation reported that 77% of all fatally injured automobile drivers were...
17. The U.S. Department of Transportation reported that 77% of all fatally injured automobile drivers were intoxicated. A random sample of 27 records of automobile driver fatalities in Kit Carson County, Colorado, showed that 15 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 a=.01. a) State the null and alternate hypotheses. b) What sampling distribution will you use? c) Compute the...
The Rails to Trails program refers to the conversion of old rail corridors into multipurpose trails...
The Rails to Trails program refers to the conversion of old rail corridors into multipurpose trails for recreation and transportation. Researchers were interested in obtaining information on characteristics of users and nonusers of a 10 ‑mile‑long paved greenway trail in Greenville, South Carolina, that connects residential areas to both a university campus and the commercial downtown area of the city. Random digit dialing of residential numbers was done using a database of exchanges. A total of 2461 persons were contacted,...
In a survey conducted by a reputable marketing agency, 231 of 1000 adults 19 years of...
In a survey conducted by a reputable marketing agency, 231 of 1000 adults 19 years of age or older confessed to bringing and using the cell phone every trip to the bathroom (contessons included testing and answering phone calls Complete parts (a) tough below Click here to view the standard normal distribution table 1). Click here to view the standard romal distrution lean 21 Why is the pointestinale found in part (c) a random variable? DA being used to make...
The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. At least how many residents do they need to survey if they want to be at least 99% confident that the sample proportion is within 0.04 of the true proportion? Statistical Tables and Charts
The Arizona Department of Transportation (ADOT) is considering changing statewide speed limits from 65 mph to 75 mph. They wish to perform analysis on p, the proportion of Arizona residents that favor this change. In order to prove that a majority of residents favor the change, ADOT wishes to test the following hypotheses using a level of significance of 0.05. Ho:p = 0.5 H:p > 0.5 ADOT wishes to design the test to have a power of 90% if the...
The Arizona Department of Transportation (ADOT) is considering changing statewide speed limits from 65 mph to 75 mph. They wish to perform analysis on p, the proportion of Arizona residents that favor this change. In order to prove that a majority of residents favor the change, ADoT wishes to test the following hypotheses using a level of significance of 0.05. Ho:p = 0.5 H1: p > 0.5 ADOT wishes to design the test to have a power of 90% if...
17. The U.S. Department of Transportation reported that 77% of all fatally injured automobile drivers were intoxicated. A random sample of 27 records of automobile driver fatalities in Kit Carson County, Colorado, showed that 15 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 a=.01. a) State the null and alternate hypotheses. b) What sampling distribution will you use? c) Compute the...
In a survey conducted by a reputable marketing agency, 231 of 1000 adults 19 years of age or older confessed to bringing and using the cell phone every trip to the bathroom (contessons included testing and answering phone calls Complete parts (a) tough below Click here to view the standard normal distribution table 1). Click here to view the standard romal distrution lean 21 Why is the pointestinale found in part (c) a random variable? DA being used to make...
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