Question

Problem 3. A study was designed to investigate the effects of two variables -- (1) a...

Problem 3.
A study was designed to investigate the effects of two variables -- (1) a student's level of mathematical anxiety and (2) teaching method -- on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 450 with a standard deviation of 30 on a standardized test. Suppose there are 500 students in the sample.
a) If the sample is normal, what percentage of scores was less than 390? Also estimate the number of students on that interval.
b) If the sample is unknown to be normal, estimate the percentage of scores between 360 and 540? Also estimate the number of students on that interval.
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
1: Sample:    Gender Verbal Math f 630 660 m 610 550 f 680 660 m...
1: Sample:    Gender Verbal Math f 630 660 m 610 550 f 680 660 m 490 390 f 510 520 m 700 700 f 640 710 f 520 470 f 530 500 m 640 570 f 710 700 f 630 520 f 670 580 f 630 610 m 360 290 f 540 490 f 490 560 m 730 760 m 760 700 f 530 670 m 710 700 f 630 610 f 530 490 f 420 410 f 490...
1. The mayor of a town has proposed a plan for the annexation of an adjoining...
1. The mayor of a town has proposed a plan for the annexation of an adjoining community. A political study took a sample of 900 voters in the town and found that 48% of the residents favored annexation. Using the data, a political strategist wants to test the claim that the percentage of residents who favor annexation is more than 44%. Find the value of the test statistic. Round your answer to two decimal places. 2. A newsletter publisher believes...
I. Solve the following problem: For the following data: 1, 1, 2, 2, 3, 3, 3,...
I. Solve the following problem: For the following data: 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6 n = 12 b) Calculate 1) the average or average 2) quartile-1 3) quartile-2 or medium 4) quartile-3 5) Draw box diagram (Box & Wisker) II. PROBABILITY 1. Answer the questions using the following contingency table, which collects the results of a study to 400 customers of a store where you want to analyze the payment method. _______B__________BC_____ A...
1. Find the area under the standard normal curve (round to four decimal places) a. To...
1. Find the area under the standard normal curve (round to four decimal places) a. To the left of  z=1.65 b. To the right of z = 0.54 c. Between z = -2.05 and z = 1.05 2. Find the z-score that has an area of 0.23 to its right. 3. The average height of a certain group of children is 49 inches with a standard deviation of 3 inches. If the heights are normally distributed, find the probability that a...
1. If you want to study the effect of hormonal changes in adolescent boys, your population...
1. If you want to study the effect of hormonal changes in adolescent boys, your population would be Group of answer choices All adolescents All the people in the world All males All adolescent males 2. Which of the following is most likely to be measured categorically? Group of answer choices Weight gain in first year college students Deterioration in driving performance under the influence of alcohol Level of authoritarianism in a sample of public accountants Species of dog appearing...
MATHEMATICS 1. The measure of location which is the most likely to be influenced by extreme...
MATHEMATICS 1. The measure of location which is the most likely to be influenced by extreme values in the data set is the a. range b. median c. mode d. mean 2. If two events are independent, then a. they must be mutually exclusive b. the sum of their probabilities must be equal to one c. their intersection must be zero d. None of these alternatives is correct. any value between 0 to 1 3. Two events, A and B,...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT