Question

The number of hours in a month a sample of nine people chosen at random from...

The number of hours in a month a sample of nine people chosen at random from a normal population work is as follows: 65, 67, 68, 68, 70, 71, 70, 66, and 66. Can we conclude that the mean of the sample differs significantly from the assumed population average of 66 hours? Given that t8,0.05 = 2.3060 .

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
A random sample of 30 male college students was selected, and their heights were measured. The...
A random sample of 30 male college students was selected, and their heights were measured. The heights (in inches) are given below. 73 66 68 70 69 69 69 66 68 70 72 74 73 71 71 72 69 68 66 73 74 72 68 71 67 73 66 73 69 72 (a) Complete the frequency distribution for the data. Make sure to enter your answers for the relative frequency as decimals, rounded to the nearest tenth. Height Frequency Relative...
Random samples of resting heart rates are taken from two groups. Population 1 exercises regularly, and...
Random samples of resting heart rates are taken from two groups. Population 1 exercises regularly, and Population 2 does not. The data from these two samples is given below: Population 1: 67, 66, 68, 72, 64, 69, 72 Population 2: 71, 71, 76, 69, 72, 70, 74, 77 pop1 <- c( 67, 66, 68, 72, 64, 69, 72 ) pop2 <- c(71, 71, 76, 69, 72, 70, 74, 77) Is there evidence, at an α=0.055α=0.055 level of significance, to conclude...
. A company that receives shipments of batteries tests a random sample of nine of them...
. A company that receives shipments of batteries tests a random sample of nine of them before agreeing to take a shipment. The company concerned that the true mean lifetime of all batteries in the shipment should be at least 50 hours. From past experience it is safe to conclude that the population distribution of lifetimes is normal with standard deviation of 3 hours. For one particular shipment the mean lifetime for a sample of nine batteries was 48.2 hours....
A class has been given a statistics exam. In a random sample of 12 students, the...
A class has been given a statistics exam. In a random sample of 12 students, the test scores are 65, 73, 74, 68, 70, 74, 69, 71, 75 73 67 70, giving us the sample statistics ¯x = 70.75 and s 2 = 9.84. Assume a normal distribution of scores. (a) Construct a 98% confidence interval for σ 2 . (b) Construct a 98% confidence interval for σ. (Use your information from Part A, and just state your confidence interval.)
The heights of people in the United States is normally distributed with mean 67 inches and...
The heights of people in the United States is normally distributed with mean 67 inches and standard deviation σ=3.75 inches. We want to know if Lee students are shorter on average than the U.S. population. Use α=0.05. Record the heights (in inches) of all the students in the class. State the null and alternate hypotheses. Compute the relevant test statistic. Compute the P-value. State your conclusion using complete sentences. Data: 72 67 76 62 66 70 66 73 67 66...
Q1. Scores in the first and fourth (final) rounds for a sample of 20 golfers who...
Q1. Scores in the first and fourth (final) rounds for a sample of 20 golfers who competed in a Golf Competition held on Guam are shown in the following table. Suppose you would like to determine if the mean score for the first round of the event is significantly different than the mean score for the fourth and final round. Does the pressure of playing in the final round cause scores to go up? Or does the increased player concentration...
Random samples of resting heart rates are taken from two groups. Population 1 exercises regularly, and...
Random samples of resting heart rates are taken from two groups. Population 1 exercises regularly, and Population 2 does not. The data from these two samples is given below: Population 1: 71, 67, 61, 62, 67, 70, 68 Population 2: 71, 68, 71, 78, 76, 73, 71, 68 Is there evidence, at an α=0.075, level of significance, to conclude that there those who exercise regularly have lower resting heart rates? (Assume that the population variances are equal.) Carry out an...
3. Ten individuals are chosen at random from a normal population and their heights are found...
3. Ten individuals are chosen at random from a normal population and their heights are found to be 63,63,66,67,68,69,70,70,71,71 inches. Test if the sample belongs to the population whose mean heights is 66 inches? Test at 95% confidence interval.
Scores in the first and final rounds for a sample of 20 golfers who competed in...
Scores in the first and final rounds for a sample of 20 golfers who competed in tournaments are contained in the table below. Answer the following questions. Player First Round Final Round Michael Letzig 70 66 Scott Verplank 67 77 D.A. Points 71 65 Jerry Kelly 73 72 Soren Hansen 73 67 D.J. Trahan 77 69 Bubba Watson 77 72 Reteif Goosen 67 68 Jeff Klauk 66 65 Kenny Perry 76 68 Aron Price 68 66 Charles Howell 72 69...
the number of hours an American adult watches tv follows a normal distribution with an average...
the number of hours an American adult watches tv follows a normal distribution with an average of 6.9 hours a day with a standard deviation of .68 hours. If we take a random sample of 13 American adults what is the probability they have a sample mean less than 7.5 hours per day?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT