it is like a timed exam and once i open up the page i have to answer the questions with 30 mins thats y i wanted to check wit u first..just like we did the last time

ok..i am posting it..pls lemme kno if u cnt cos i have 30mins to finish up

Customer:replied 8 years ago.

.

In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36. Construct a 99% confidence interval for the population mean.

a. ($138, $162)

b. ($18, $54)

c. ($537, $654)

d. ($238, $274)

Save Answer

2. ES3L 4.1-20 (Points: 1)
Solve the problem.

Determine the probability distribution's missing value.
The probability that a tutor will see 0, 1, 2, 3, or 4 students

a. -0.29

b. 0.95

c. 0.24

d. 0.76

Save Answer

3. ES3L 6.2-6 (Points: 1)
Solve the problem.

Find the value of E, the margin of error, for c = 0.99, n = 15 and s = 5.7.

a. 1.13

b. 4.38

c. 3.86

d. 4.49

Save Answer

4. ES3L 4.3-4 (Points: 1)
Solve the problem.

A statistics professor finds that when he schedules an office hour at the 10:30 a.m. time slot, an average of three students arrives. Use the Poisson distribution to find the probability that in a randomly selected office hour no students will arrive.

a. 0.0498

b. 0.1108

c. 0.1225

d. 0.0743

Save Answer

5. ES3L 5.1-2 (Points: 1)
Solve the problem.

Find the area under the standard normal curve to the right of z = 1.

a. 0.1397

b. 0.1587

c. 0.5398

d. 0.8413

Save Answer

6. ES3L 6.2-22 (Points: 1)
Solve the problem.

The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.

2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8

Find a 98% confidence interval for the true mean.

a. (2.12, 3.14)

b. (3.11, 4.35)

c. (0.67, 1.81)

d. (1.55, 3.53)

Save Answer

7. ES3L 4.1-23 (Points: 1)
Solve the problem.

The random variable x represents the number of boys in a family of three children. Assuming that boys and girls are equally likely, find the mean and standard deviation for the random variable x.

a. mean: 1.50; standard deviation: 0.87

b. mean: 2.25; standard deviation: 0.76

c. mean: 1.50; standard deviation: 0.76

d. mean: 2.25; standard deviation: 0.87

Save Answer

8. ES3L 6.2-13 (Points: 1)
Solve the problem.

Construct a 95% confidence interval for the population mean, µ. Assume the population has a normal distribution. A sample of 25 randomly selected students has a mean test score of 81.5 with a standard deviation of 10.2.

a. (66.35, 69.89)

b. (87.12, 98.32)

c. (77.29, 85.71)

d. (56.12, 78.34)

Save Answer

9. ES3L 4.1-2 (Points: 1)
Solve the problem.

State whether the variable is discrete or continuous.
The height of a player on a basketball team

a. discrete

b. continuous

Save Answer

10. ES3L 4.1-3 (Points: 1)
Solve the problem.

State whether the variable is discrete or continuous.
The cost of a Statistics textbook

We need more info for #2. Here are the ones I am sure of. Please give me info for #2, and possibly post the other ones in a new thread.

-Scott

In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36. Construct a 99% confidence interval for the population mean.

150-2.58*36/sqrt(60) to 150 +2.58*36/sqrt(60)

a. ($138, $162)

b. ($18, $54)

c. ($537, $654)

d. ($238, $274)

Save Answer

2. ES3L 4.1-20 (Points: 1) Solve the problem.

Determine the probability distribution's missing value. The probability that a tutor will see 0, 1, 2, 3, or 4 students

a. -0.29

b. 0.95

c. 0.24

d. 0.76

5. ES3L 5.1-2 (Points: 1) Solve the problem.

Find the area under the standard normal curve to the right of z = 1.

a. 0.1397

b. 0.1587

c. 0.5398

d. 0.8413

Save Answer

9. ES3L 4.1-2 (Points: 1) Solve the problem.

State whether the variable is discrete or continuous. The height of a player on a basketball team

a. discrete

b. continuous

Save Answer

10. ES3L 4.1-3 (Points: 1) Solve the problem.

State whether the variable is discrete or continuous. The cost of a Statistics textbook

Find the area under the standard normal curve between z = 0 and z = 3.

a. 0.9987

b. 0.0010

c. 0.4987

d. 0.4641

Save Answer

2. ES3L 5.1-22 (Points: 1)
Solve the problem.

Find the area of the indicated region under the standard normal curve.

a. 0.1292

b. 0.1504

c. 0.8489

d. 0.0212

Save Answer

3. ES3L 6.1-10 (Points: 1)
Solve the problem.

A random sample of 40 students has a mean annual earnings of $3120 and a standard deviation of $677. Find the margin of error if c = 0.95.

a. $210

b. $77

c. $2891

d. $7

Save Answer

4. ES3L 5.3-10 (Points: 1)
Solve the problem.

For the standard normal curve, find the z-score that corresponds to the 7th decile.

a. 0.12

b. 0.53

c. 0.47

d. 0.98

Save Answer

5. ES3L 4.1-6 (Points: 1)
Solve the problem.

State whether the variable is discrete or continuous.
The number of goals scored in a soccer game

a. continuous

b. discrete

Save Answer

6. ES3L 4.2-25 (Points: 1)
Solve the problem.

The probability that a tennis set will go to a tie-breaker is 20%. What is the probability that two of three sets will go to tie-breakers?

a. 0.384

b. 0.04

c. 0.096

d. 0.2

Save Answer

7. ES3L 6.1-6 (Points: 1)
Solve the problem.

Find the critical value zc that corresponds to a 95% confidence level.

a. ±1.96

b. ±2.575

c. ±1.645

d. ±2.33

Save Answer

8. ES3L 5.3-21 (Points: 1)
Solve the problem.

Compare the scores: a score of 220 on a test with a mean of 200 and a standard deviation of 21 and a score of 90 on a test with a mean of 80 and a standard deviation of 8.

a. A score of 90 with a mean of 80 and a standard deviation of 8 is better.

b. You cannot determine which score is better from the given information.

c. A score of 220 with a mean of 200 and a standard deviation of 21 is better.

d. The two scores are statistically the same.

Save Answer

9. ES3L 5.3-11 (Points: 1)
Solve the problem.

Find the z-scores for which 90% of the distribution's area lies between -z and z.

a. (-1.645, 1.645)

b. (-2.33, 2.33)

c. (-1.96, 1.96)

d. (-0.99, 0.99)

Save Answer

10. ES3L 5.3-32 (Points: 1)
Solve the problem.

In a certain normal distribution, find the standard deviation s when µ = 50 and 10.56% of the area lies to the right of 55.

Compare the scores: a score of 220 on a test with a mean of 200 and a standard deviation of 21 and a score of 90 on a test with a mean of 80 and a standard deviation of 8.

a. A score of 90 with a mean of 80 and a standard deviation of 8 is better.

b. You cannot determine which score is better from the given information.

c. A score of 220 with a mean of 200 and a standard deviation of 21 is better.
d. The two scores are statistically the same

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