2. The mean satisfaction score of employees in a firm is 947 with a standard deviation...

2. The mean satisfaction score of employees in a firm is 947 with a standard deviation of 205. If you select 60 employees randomly, what is the probability that the mean is below 897?

Expert Solution

orchestra answered 1 year ago

The mean SAT score in mathematics, μ , is 559 . The standard deviation of these...

The mean SAT score in mathematics, μ , is 559 . The standard deviation of these scores is 39 . A special preparation course claims that its graduates will score higher, on average, than the mean score 559 . A random sample of 50 students completed the course, and their mean SAT score in mathematics was 561 . At the 0.05 level of significance, can we conclude that the preparation course does what it claims? Assume that the standard deviation...

assume that IQ score are randomly distributed with a mean of 100 and a standard deviation...

assume that IQ score are randomly distributed with a mean of 100 and a standard deviation of 15 . if 49 are randomly find the probability that their mean IQ score is greater than 98

3. The national mean score of an aptitude test is 50 with a standard deviation of...

3. The national mean score of an aptitude test is 50 with a standard deviation of 5. I think students at Ohio University can earn higher scores than people nationally. I survey 30 students at Ohio University and find a mean 57 with a standard deviation of 6.8. Is the mean scores of Ohio University students significantly more than the mean score of the aptitude test nationally? (use  = .05) a. State the null and alternative hypotheses in symbols....

A population distribution of score has a mean = 100 and a standard deviation of 10....

A population distribution of score has a mean = 100 and a standard deviation of 10. Researchers plan to take a sample size of N=25. Based on the central limit theorem, 68.26% of all possible means are between the sample means of ______ A) 90 and 100 B) 95 and 100 C) 98 and 102 D) 97 and 103

assume that in 2018 the mean mathematics sat score was 536 and the standard deviation was...

assume that in 2018 the mean mathematics sat score was 536 and the standard deviation was 115. a sample of 68 scores is chosen. a) what is the sampling distribution of *? b) what is the probability the sample mean score is less than 510? c) what is the probability the sample mean score is between 485 and 525? d) what is the probability the sample mean score is greater than 480? e) would it be unusual for the sample...

4. The mean score on a standardized test is 540 with a standard deviation of 55....

4. The mean score on a standardized test is 540 with a standard deviation of 55. What percent of students taking the test scored above 625? (nearest hundredth) 5. True or False. A z-score is the number of standard deviations from the median. 6. True or False. A z-score cannot be negative. 7. True or False. If the standard deviation is small, the data values are very varied. 8. True or False. The standard error of the mean is smaller...

Find the Standard Score (z-score) round to 2 decimal places and the standard deviation Option Amazon...

Find the Standard Score (z-score) round to 2 decimal places and the standard deviation Option Amazon Description of Item Price Standard Score (z-score) (round to 2 decimal places) 1 Beginner Acoustic Guitar Set $84.99 2 Brazilian Double Hammock $27.99 3 MMIZOO Resistance Loop Exercise Bands (set of 5) $9.99 4 Big and Tall Office Chair $185.99 5 Adjustable Laptop Bedstand Table $32.98 6 HP Envy Pro 6455 Wireless All-in-One Printer $149.99 7 Apple Watch Series 3 $169.00 8 Waterproof Portable...

Which mean, standard deviation, and x-value set corresponds to a z-score of -2? a.) x-value =...

Which mean, standard deviation, and x-value set corresponds to a z-score of -2? a.) x-value = 35 mean = 21 standard deviation = 7 b.) x-value = 80 mean = 90 standard deviation = 10 c.) x-value = 50 mean = 60 standard deviation = 5 d.) x-value = 89 mean = 80 standard deviation = 9

Find the sample mean and sample standard deviation of your data. What is the Z score?...

Find the sample mean and sample standard deviation of your data. What is the Z score? Data 1 223 2 200 3 154 4 217 5 223 6 157 7 178 8 159 9 350 10 243 11 325 12 298 Pick three bills from the last 12 months and change the values into z-scores. What does the z-score tell you about that particular month? Between what two values would be considered a normal bill? Remember, being within 2 Standard...

Let the mean test score be 80 and standard deviation be 10. Find probability that you...

Let the mean test score be 80 and standard deviation be 10. Find probability that you will get a score higher than 90. Find the probability that you will receive a score between 75 and 90. Find the probability that you will receive a score less than 60 Please explain more, thanks!

Question