Question

On an examination in psychology 12 students in one class had a mean grade of 78...

On an examination in psychology 12 students in one class had a mean grade of 78 with a standard deviation of 6, while 15 students in another class had a mean grade of 74 with a standard deviation of 8. Using a significance level of 0.05, determine whether the first group is superior to the second group.

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
On an examination in Statistics 12 students in one class had a mean grade of 78...
On an examination in Statistics 12 students in one class had a mean grade of 78 with a standard deviation of 6, while 15 students in another class had a mean grade of 74 with a standard deviation of 8. Using a significance level of 0.05, determine whether the first group is superior to the second group.
An examination was given to two classes consisting of 40 and 50 students, respectively. In the...
An examination was given to two classes consisting of 40 and 50 students, respectively. In the first class the mean grade was 74 with a standard deviation of 8, while in the second class the mean grade was 78 with a standard deviation of 7. Is there a significant difference between the performance of the two classes at a level of significance of 5%?
In your psychology class, the mean exam score is 72 and the standard deviation is 12....
In your psychology class, the mean exam score is 72 and the standard deviation is 12. You scored 78. In your biology class, the mean exam score is 56 and the standard deviation is 5. You scored 66. If your professors grade "on a curve" (i.e., according to the distribution of scores), for which exam would you expect to get a better grade? (Hint: Convert your exam scores to z-scores). A) Biology B) Psychology
The average grade of a Calculus class is 78 with a standard deviation of 8. How...
The average grade of a Calculus class is 78 with a standard deviation of 8. How many students will get grades between 70 and 90? If the top 15% of the students will receive an A, what is the cut off grades for A?
An Examination in Statistics is given to certain group of statisticians having a mean grade for...
An Examination in Statistics is given to certain group of statisticians having a mean grade for 20 boys as 65 and a standard error of 6 while that of the girls counterpart numbering 25 has Amen grade of 70 with standard error of assuming the population is approximately normal with equal variance. test the hypothesis that the girls perform better than the boys at 0.01 level of significance. An Examination is given to certain group of Statisticians having a mean...
The final exam grade of a mathematics class has a skewed distribution with mean of 78...
The final exam grade of a mathematics class has a skewed distribution with mean of 78 and standard deviation of 7.2. If a random sample of 38 students selected from this class, then what is the probability that the average final exam grade of this sample is between 75 and 80? Answer: (keep 4 decimal places)
8.         In a statistics class, the average grade on the final examination was 75 with a standard...
8.         In a statistics class, the average grade on the final examination was 75 with a standard deviation of 5. a. Use Chebyshev’s theorem to answer: At least what percentage of the students received grades between 50 and 100?                b.          What is the z-score for a student who had an examination score of 91?            c.   Would the test score from part b., be considered an outlier? Explain.                         9. Assume we have a symmetric or bell shaped distribution. Using...
The heights of students in a 5th grade class are normally distributed with mean height 45...
The heights of students in a 5th grade class are normally distributed with mean height 45 inches and standard deviation 5 inches. The students are divided into groups of 3. What height is such that the probability that the total height for a given group exceeds that height is 5%?
A school psychologist was interested in whether the 12 students in the chess club had a...
A school psychologist was interested in whether the 12 students in the chess club had a higher or lower mean grade point average (GPA) than the other students at a school. The overall GPA at the school was 2.55 with a standard deviation of 0.5; the distribution of GPAs was approximately normal. The average GPA of students in the chess club was 2.76. Using the .05 significance level, did the chess club represent a population that was different from students...
The final exam grade of a statistics class has a skewed distribution with a mean of...
The final exam grade of a statistics class has a skewed distribution with a mean of 78 and a standard deviation of 7.8. If a random sample of 36 students selected from this class, then what is the probability that the average final exam grade of this sample is between 75 and 80? (round to 4 decimal places)
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT