7.A science teacher claims that the mean scores on a science assessment test for fourth grade boys andgirls are equal. The mean score for 18 randomly selected boys is 153 with a standard deviation of 23 and themean score for 20 randomly selected girls is 149 with a standard deviation of 30. At a-0.01, can you reject theteacher's claim? Assume the populations are normally distributed and the variance are not equal. For credit,your work must include a filled out standardized test statistic formula. You may not use the following dfformula for this problem.2df=+¯ (s² / m₂)³²_ (s² / m₂)³²n,+n₁-11₂-1

Given that Sample sizes n1=18 , n2=20 Sample means x1=153 , x2=149 Standard deviation s1=23 ,…

Answered: A science teacher claims that the mean…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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I need help on this question below The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test had a mean of 35 and a standard deviation of 9. High School GPAs had a mean of 2.9 and a standard deviation of 0.2.What high school GPA do you need to equal a score of 56 on the Accuplacer test?Give answer to two decimal places.
I have asked this question twice and both times it has been wrong. Answer given F=.82 and .77 both these are incorrect. A bakery is considering buying one of two gas ovens. The bakery requires that the temperature remain constant during a baking operation. A study was conducted to measure the variance in temperature of the ovens during the baking process. The variance in temperature before the thermostat restarted the flame for the Monarch oven was 3.3 for 22 measurements. The variance for the Kraft oven was 4 for 25 measurements. Does this information provide sufficient reason to conclude that there is a difference in the variances for the two ovens? Assume measurements are normally distributed and use a 0.02 level of significance.
One of the z-score formulas will help on this question. Scores on the SAT test are normally distributed with a mean of 500 and standard deviation of 100 points. Pretend someone scored 400 on the math portion of the SAT test. What would be the z-score cut off for this score? A. 1.0 B. -1.0 C. 0 D. 2.0
The life of a butterfly is normally distributed with a mean of 50 days. You took a random sample of 25 such butterflies. The mean life for this sample is 47 days a standard deviation of 3 days. At α = 0.05. a. Test to see if the average life of a butterfly is different from 50 days. b. Your friend believes that the life of a butterfly is less than 50 days. Is she correct?
Hello, I need a little help trying to figure out how to get the Deviation from Mean and calculations. I would appreciate any assistance so that I can understand the lab.
The average score on a statistics test was 2.52 with a standard deviation of 0.75. The teacher suspects that the exam was very difficult; Based on the above, he wants to adjust the scores so that the mean is 3.58 and the standard deviation is 0.25. Compute the values a and b such that the fit of type aX+b provide the desired mean and variance? Calculate: a=?b=?
Step 1 of 3. State the null and alternative hypotheses for the test. Step 2 of 3. Compute the value of the test statistic. Round your answer to three decimal places Step 3 of 3. Draw a conclusion and interpret the decision.
Suppose that IQ scores have a bell-shaped distribution with a mean of 98 and a standard deviation of 17. Using the empirical rule, what percentage of IQ scores are greater than 115? Please do not round your answer. Answer How to enter your answer (opens in new window) 442 1 9 a Z mebook x360 ning from any angle. 2 S # 3 X e C $ 4 % 5 JL r t f g 6 b y h & 7 O n % * 8 N O i m ( 9 k 4 O 0 1 alt P i Tables Keypad Keyboard Shortcuts Submit Answer [ + ? 1 It Oct 2 10:29 4 1 8 backspace USE YOUR SMARTPHONE FOR
Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.6 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 14 samples is 4.9 ppm with a variance of 1.2 Does the data support the claim at the 0.01 level? Assume the population distribution is approximately normal. Step 2 of 5 : Find the value of the test statistic. Round your answer to three decimal places.
Please solve only only the last question.

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