Question

2. The North Dakota department of transportation conducted a study to find the average amount of...

2. The North Dakota department of transportation conducted a study to find the average amount of time ND residents spend commuting during the fourth of July weekend. They surveyed 144 drivers and the study found out that the driver’s population spent an average of 20 hours commuting with a standard deviation of 10 hours.

(a) What is the standard error of the mean?

(b) Compute the probability the sample mean is greater than 20 hours?

(c) Compute the probability the sample mean is less than 18 hours?

(d) Compute the probability the sample mean is between 18 and 22 hours?

PLEASE SHOW ALL WORK

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Show all work and answer A and B. The average teacher's salary in North Dakota is...
Show all work and answer A and B. The average teacher's salary in North Dakota is $37,764. Assume a normal distribution with a= $5100. A. What is the probability that a randomly selected teacher's salary is greater than $40,000? B. For a sample of 75 teachers, what is the probability that the sample mean is greater than $40,000?
A study conducted a few years ago claims that the adult males spend an average of...
A study conducted a few years ago claims that the adult males spend an average of 11 hours a week watching sports on television. A recent sample of 100 adult males showed that the mean time they spend per week watching sports on television is 9.50 hours with a standard deviation of 2.2 hours. a. Use the result to give a 95% confidence interval for the mean time they spend per week watching sports on television. a. Does the study...
In a study of monthly salary distribution of residents in Paris conducted in year 2015, it...
In a study of monthly salary distribution of residents in Paris conducted in year 2015, it was found that the salaries had an average of €2200 (EURO) and a standard deviation of €550. Assume that the salaries were normally distributed. Question 1: Consider sampling with sample size 64 on the above population. Compute the mean of the sampling distribution of the mean (?̅). Question 2: Compute the standard deviation of the sampling distribution of the mean in Question 1 above....
Question 40: A study is conducted to find out the average number of students' self-study hours...
Question 40: A study is conducted to find out the average number of students' self-study hours a week. The results of a pilot survey show that the average number of hours of self-study is 18 hours with a standard deviation of 3 hours. With 98% confidence, if you want the error to be estimated to be zero + 0.5 hours, how many students should you choose to investigate?
According to the U.S. Department of Transportation, people in the age group of 15 to 20...
According to the U.S. Department of Transportation, people in the age group of 15 to 20 spend an average of 25 minutes driving every day. Assume that    You randomly select 50 drivers in this age group and find the sample mean . Which of the following statements are true about , as random variable? I. The mean of sample mean (x bar)is equal to the mean of the population. II. The standard deviation of the sample mean is equal...
According to the South Dakota Department of Health, the mean number of hours of TV viewing...
According to the South Dakota Department of Health, the mean number of hours of TV viewing per week is higher among adult women than men. A recent study showed women spent an average of 34 hours per week watching TV and men 29 hours per week ( www.state.sd.us/DOH/Nutrition/TV.pdf). Assume that the distribution of hours watched follows the normal distribution for both groups, and that the standard deviation among the women is 4.5 hours and is 5.1 hours for the men....
Geico Insurance Company conducted a survey to determine the average amount of time their customers spend...
Geico Insurance Company conducted a survey to determine the average amount of time their customers spend waiting on hold when calling to speak to a customer service representative. Based on a simple random sample, they surveyed 58 customers. The statistics showed that customers spent an average of 7.86 minutes on hold, with a variance of 32.6. Calculate the standard error of the mean. Report your answer to 4 decimal places, using conventional rounding rules.
According to a 2003 study published in Developmental Medicine and Child Neurology, the amount of time...
According to a 2003 study published in Developmental Medicine and Child Neurology, the amount of time per day normal children (ages 8-15 years old) spend in an upright position (i.e., not sitting or lying down) is normally distributed with a mean of 5.4 hours and a standard deviation of 1.3 hours. What percent of children spend less than 3.5 hours upright per day? If I collect a random sample of four children, what is the probability that exactly 1 of...
A report shows that the average amount of money spent on public transportation (taxis, subway, etc.)...
A report shows that the average amount of money spent on public transportation (taxis, subway, etc.) by millennials in Philadelphia, PA (per week) is about $78, with a standard deviation of $19. The exact distribution is not known, but a random sample of 56 millennials from Philadelphia is selected. a. Describe the sampling distribution of the sample mean x (4 pts) The mean: x = _________________ The standard error on the mean (round to 2 dec. places):  x =...
A study found that highway drivers in one states traveled ot an average soeed of 58.8...
A study found that highway drivers in one states traveled ot an average soeed of 58.8 miles oer hour (MPH). Assume the population standard deviation is 6.0 MPH. Complete parts a through d below: a). what is the probability that a sample of 30 of drivers will have a sample mean less than 57 MPH? P(x< 57)= b). what is the probability that a sample of 50 of drivers will have a sample mean less than 57 MPH? P(x< 57)=...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT