Interstate Speeds It has been reported that the standard deviation of the speeds of drivers on...
Interstate Speeds It has been reported that the standard deviation of the speeds of drivers on Interstate 75 near Findlay, Ohio, is 8 miles per hour for all vehicles. A driver feels from experience that this is very low. A survey is conducted, and for 26 drivers the standard deviation is 8.8 miles per hour. At a=0.01 , is the driver correct? Assume the variable is normally distributed.
Find the null and alternative hypothesis, Find the critical value.(c)Compute the test value.(d)Make the decision.(e)Summarize the results.
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Interstate Speeds It has been reported that the
standard deviation of the speeds of drivers on...
OUPLICATIIULILLIOLI 12. Interstate Speeds It has been reported that the stan- dard deviation of the speeds...
OUPLICATIIULILLIOLI 12. Interstate Speeds It has been reported that the stan- dard deviation of the speeds of drivers on Interstate 75 near Findlay, Ohio, is 8 miles per hour for all vehicles. A driver feels from experience that this is very low. A survey is conducted, and for 50 randomly selected drivers the standard deviation is 10.5 miles per hour. At a= 0.05, is the driver correct?
Penndot claims that the standard deviation of the speed of drivers in the streets of the...
Penndot claims that the standard deviation of the speed of drivers in the streets of the Historical Downtown of the Greater Bradford Metropolitan Area is 8 miles per hour for all vehicles. Your uncles and aunts, who have a responsibility to uphold the virtues of speeding feel that Penndot’s estimate is low. A survey is conducted by UPB students and for 50 randomly selected drivers, the standard deviation is 10.5 miles per hour. Is Penndot’s claim believable ? Is this...
3. The distribution of passenger vehicle speeds on the Interstate 5 Freeway is nearly normal with a mean of 72.6 mi/hr and a standard deviation of 4.78 mi/hr. (Use the Normal Table). Round all percen...
3. The distribution of passenger vehicle speeds on the Interstate 5 Freeway is nearly normal with a mean of 72.6 mi/hr and a standard deviation of 4.78 mi/hr. (Use the Normal Table). Round all percents to the nearest tenth. What percent of passenger vehicles travel slower than 80 miles per hour? a. b. What percent of passenger vehicles travel between 60 and 80 miles per hour? How fast do the fastest 5% of passenger vehicles travel? C. d. The speed...
Bringing all of section 6.2 together... The distribution of passenger vehicle speeds traveling on the Interstate...
Bringing all of section 6.2 together... The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (1-5) in California is nearly normal with a mean of 72.6 miles/hour and a standard deviation of 4.78 miles/hour. (a) What percent of passenger vehicles travel slower than 80 miles/hour? % (round to two decimal places) (b) What percent of passenger vehicles travel between 60 and 80 miles/hour? % (round to two decimal places) (c) How fast do the fastest 5% of...
Suppose the speeds of vehicles traveling on a highway are normally distributed and have a known...
Suppose the speeds of vehicles traveling on a highway are normally distributed and have a known population standard deviation of 7 miles per hour and an unknown population mean. A random sample of 32 vehicles is taken and gives a sample mean of 64 miles per hour Find the margin of error for the confidence interval for the population mean with a 98% confidence level Z005 Z0.025 Z0.0 Z0.005 0.10 1.282 1.645 1.960 2.326 2.576 You may use a calculator...
A construction zone on a highway has a posted speed limit of 40 miles per hour....
A construction zone on a highway has a posted speed limit of 40 miles per hour. The speeds of vehicles passing through this construction zone are normally distributed with a mean of 46 miles per hour and a standard deviation of 4 miles per hour. A. The fastest 10% of the vehicles passing through this construction zone are going at what speed?
Given a frequency distribution of 10,000 scores which has a mean of 120 and a standard...
Given a frequency distribution of 10,000 scores which has a mean of 120 and a standard deviation of 15, 94.13% of those tested scored 135 or below. T or F The highway department conducted a study measuring driving speeds on a local section of the interstate highway. They found an average speed of mu=58 miles per hour with a standard deviation of 10. Given this information, what proportion of the cards are traveling between 55 and 65 miles per hour?...
1. A police officer is concerned about speeds on a certain section of Interstate 95. The data acc...
1. A police officer is concerned about speeds on a certain
section of Interstate 95. The data accompanying this exercise show
the speeds of 40 cars on a Saturday afternoon.
a. The speed limit on this portion of
Interstate 95 is 66 mph. Specify the competing hypotheses in order
to determine if the average speed is greater than the speed
limit.
H0: μ = 66;
HA: μ ≠ 66
H0: μ ≥ 66;
HA: μ < 66
H0: μ ≤...
Indy 500 Qualifier Speeds The speeds in miles per hour of six randomly selected qualifiers for...
Indy 500 Qualifier Speeds The speeds in miles per hour of six randomly selected qualifiers for the Indianapolis 500 (in 2012) are listed below. Estimate the mean qualifying speed with 90% confidence. Assume the variable is normally distributed. Use a graphing calculator and round the answers to at least two decimal places. 222.929 226.240 225.172 222.891 226.484 223.684 Send data te Excel Thunderstorm Speeds A meteorologist who sampled 5 thunderstorms found that the average speed at which they traveled across...
22. The Wall Street Journal (Feb. 15, 1972) reported that General Electric was sued in Texas for sex discrimination after imposing a height requirement of 57 67" The suit claimed that this restri...
22. The Wall Street Journal (Feb. 15, 1972) reported that General Electric was sued in Texas for sex discrimination after imposing a height requirement of 57 67" The suit claimed that this restriction eliminated more than 94% of adult females from consideration for employment by GE. If the height of adult women is normally distributed with a mean of '6" (66") and a standard deviation of 2", what proportion of adult women would be excluded from employment as a result...
OUPLICATIIULILLIOLI 12. Interstate Speeds It has been reported that the stan- dard deviation of the speeds of drivers on Interstate 75 near Findlay, Ohio, is 8 miles per hour for all vehicles. A driver feels from experience that this is very low. A survey is conducted, and for 50 randomly selected drivers the standard deviation is 10.5 miles per hour. At a= 0.05, is the driver correct?
3. The distribution of passenger vehicle speeds on the Interstate 5 Freeway is nearly normal with a mean of 72.6 mi/hr and a standard deviation of 4.78 mi/hr. (Use the Normal Table). Round all percents to the nearest tenth. What percent of passenger vehicles travel slower than 80 miles per hour? a. b. What percent of passenger vehicles travel between 60 and 80 miles per hour? How fast do the fastest 5% of passenger vehicles travel? C. d. The speed...
Bringing all of section 6.2 together... The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (1-5) in California is nearly normal with a mean of 72.6 miles/hour and a standard deviation of 4.78 miles/hour. (a) What percent of passenger vehicles travel slower than 80 miles/hour? % (round to two decimal places) (b) What percent of passenger vehicles travel between 60 and 80 miles/hour? % (round to two decimal places) (c) How fast do the fastest 5% of...
Suppose the speeds of vehicles traveling on a highway are normally distributed and have a known population standard deviation of 7 miles per hour and an unknown population mean. A random sample of 32 vehicles is taken and gives a sample mean of 64 miles per hour Find the margin of error for the confidence interval for the population mean with a 98% confidence level Z005 Z0.025 Z0.0 Z0.005 0.10 1.282 1.645 1.960 2.326 2.576 You may use a calculator...
1. A police officer is concerned about speeds on a certain
section of Interstate 95. The data accompanying this exercise show
the speeds of 40 cars on a Saturday afternoon.
a. The speed limit on this portion of
Interstate 95 is 66 mph. Specify the competing hypotheses in order
to determine if the average speed is greater than the speed
limit.
H0: μ = 66;
HA: μ ≠ 66
H0: μ ≥ 66;
HA: μ < 66
H0: μ ≤...
Indy 500 Qualifier Speeds The speeds in miles per hour of six randomly selected qualifiers for the Indianapolis 500 (in 2012) are listed below. Estimate the mean qualifying speed with 90% confidence. Assume the variable is normally distributed. Use a graphing calculator and round the answers to at least two decimal places. 222.929 226.240 225.172 222.891 226.484 223.684 Send data te Excel Thunderstorm Speeds A meteorologist who sampled 5 thunderstorms found that the average speed at which they traveled across...
22. The Wall Street Journal (Feb. 15, 1972) reported that General Electric was sued in Texas for sex discrimination after imposing a height requirement of 57 67" The suit claimed that this restriction eliminated more than 94% of adult females from consideration for employment by GE. If the height of adult women is normally distributed with a mean of '6" (66") and a standard deviation of 2", what proportion of adult women would be excluded from employment as a result...
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