In a class of twenty-five 15-year old girls the average height is M = 62.60 inches. The national average for girls at this age is reported as follows: µ = 63.80 inches with a standard deviation, s = 2.66 inches. What is the effect size Cohen’s d and what does it tell us about the effect?   Compute the z-statistic.   An analysis was conducted to determine whether the average height of the 25 girls in the same class is different from the general population of 15-year old girls and the p-value was .024. If the researcher used a = .01 what is your decision and what do you conclude based on why the analysis was conducted?

Question
  1. In a class of twenty-five 15-year old girls the average height is M = 62.60 inches. The national average for girls at this age is reported as follows: µ = 63.80 inches with a standard deviation, s = 2.66 inches.

What is the effect size Cohen’s d and what does it tell us about the effect?

 

Compute the z-statistic.

 

An analysis was conducted to determine whether the average height of the 25 girls in the same class is different from the general population of 15-year old girls and the p-value was .024. If the researcher used a = .01 what is your decision and what do you conclude based on why the analysis was conducted?

Expert Answer

1 Rating

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Math
Statistics

Hypothesis Testing

Related Statistics Q&A

Find answers to questions asked by students like you.

Q: Find the probability and interpret the results. If convenient, use technology to find the probabilit...

A: Click to see the answer

Q: You are the foreman of the Bar-S cattle ranch in Colorado. A neighboring ranch has calves for sale, ...

A:   Steps to plot scatter plot in excel is shown below Enter the data in excel as shown above-> Go ...

Q: The data below are the ages of a random sample of 8 men in a bar. It is known that the population of...

A: Given the data of ages of a random sample of 8 men in a bar. It is known that the population of ages...

Q: Periodically, the county Water Department tests the drinking water of homeowners for contminants suc...

A: (a) The 99% confidence interval for the mean lead level in water specimens of the sub development is...

Q: For the following situation, find the mean and standard deviation of the population. List all sample...

A: Introduction: We have obtained the population mean and population standard deviation using Excel.

Q: The population mean and standard deviation are given below. Find the required probability and determ...

A: Click to see the answer

Q: Use the central limit theorem to find the mean and standard error of the mean of the indicated sampl...

A: The mean of the sampling distribution is, μx¯=μ=101 Thus, the mean of the sampling distribution is 1...

Q: Consider the binomial experiment  with n = 8 trials where the probability of success on a single tri...

A: Click to see the answer

Q: Among the most exciting aspects of a university professor's life are the departmental meetings where...

A: Here it is given that - Total number of samples (n) =20  Standard deviation (σ) = 8

Q: Suppose an electric-vehicle manufacturing company estimates that a driver who commutes 50 miles per ...

A: Click to see the answer

Q: 5 S + X, - X, 3 e) where n=6, where and are the sample means, and and are the sample variances.

A: The provided information is: Xi~Nμ=μ, σ2=9Yi~Nμ=0, σ2=25 Sample meany¯=∑Yii=1n=66 , n=6Sample varian...

Q: Assume the random variable X is normally distributed with mean μ=50 and standard deviation σ=7. Find...

A: It is given that, the random variable X is normally distributed with mean μ=50 and standard deviatio...

Q: A random of families in a particular street resulted in the following family sizes 5,6,7,4,3,8,2, an...

A: Click to see the answer

Q: For a random variable that is normally distributed with mean equal to 1300 and standard deviation eq...

A: Click to see the answer

Q: The test statistic of z=−2.26 is obtained when testing the claim that p=3/5. a. Using a significance...

A: Given, p=3/5 H0 : p =3/5 H1 : p <>3/5 test-statistic z = -2.26 at significance level of α=0.01...

Q: A company wants to have 6-digit phone extensions with the first digit not being zero. How many diffe...

A: Click to see the answer

Q: The height of women ages 20-29 is normally distributed, with a mean of 63.9 inches. Assume o = 2.8 i...

A: GIVEN: The height of women ages 20-29 is normally distributed with mean 63.9 inches and standard dev...

Q: A random sample of  n1 = 49  measurements from a population with population standard deviation  σ1 =...

A: Click to see the answer

Q: Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at All...

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want solution...

Q: Translate 69±19into interval notation.

A: 69 ± 19 Translate in interval notation is given by,

Q: M&M plain candies come in various colors. According to the M&M/Mars Department of Consumer A...

A: Probability is the chances of occurring an event. It lies between 0 and 1 M&M plain candles come...

Q: Translate the interval (79,106) into plus/minus notation.

A: Given information- We have given the interval = (79, 106) We know that- Confidence interval = Mean ±...

Q: You want to do a simulation where 10% are left handed, 89% are right handed, and 1% are ambidextrous...

A: It is given that one want to do a simulation where 10% are left-handed, 89% are right-handed, and 1%...

Q: A binomial probability experiment is conducted with the given parameters. Compute the probability of...

A: From the provided information, The probability (p) = 0.5 Sample size (n) = 5 The process will follow...

Q: Assigned Media E Question He Find the area of the shaded region. The graph to the right depicts IQ s...

A: IQ score of adults is normally distributed with mean 100 and standard deviation 15. Let X is the IQ ...

Q: Standardized measures seem to indicate that the average level of anxiety has increased gradually ove...

A: 1. Sample size, n is 16. Thus, the degrees of freedom for the test is 15(=16-1). The sample mean, M ...

Q: Which of the following scenario is an example of a matched-pairs design? Group of answer choices co...

A: In matched pair design the same subjects are observed under two different conditions.

Q: Let the sample mean of a set of 20 data points be 30. If it is discovered that a data point having v...

A: Given that the sample size is 20 and the sample mean is 30. That is, n=20 and x¯=30 The sample mean ...

Q: 4 and 5

A: Solution: The grouped frequency distribution table is given showing the results of a statistics test...

Q: For large simple random samples from any population, the standard error of the sampling distribution...

A: Click to see the answer

Q: According to a research​ institution, the average hotel price in a certain year was ​$97.27. Assume ...

A: Given: Average hotel price by research institution μ=$97.27 Population standard deviation σ=$21.00 S...

Q: Claim: Most adults would erase all of their personal information online if they could. A software fi...

A: State the hypotheses. That is, there is no evidence that the most of the adults would erase all of ...

Q: Suppose you are in a restaurant and the menu is as follows: 6 beverages, 11 appetizers, 9 main cours...

A: We have 6B, 11A, 9M, 5D. Now, out of these available options, we need to select exactly one object, ...

Q: Let the sample mean of a set of 20 data points be 30. If it is discovered that a data point having v...

A: Click to see the answer

Q: Ackerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better ...

A: From provided information, claim is score for students using e-books were significantly different fr...

Q: According to the Central Limit Theorem, the sampling distribution of the mean will be approximately ...

A: Normal distribution is most widely used in statistics. It is of utmost importance in today's world. ...

Q: Bob owns 15 different books. He wants to pick out and arrange 4 of these books left-to-right on a si...

A: Click to see the answer

Q: With an automobile mobing 30 mph, the mean stopping distance has been 65 inches. A new break system ...

A: a) The Null hypothesis is       Alternative Hypothesis is

Q: Headache No Headache Viagra Treatment 117 617 Placebo 29 696 1. Is the study retrospective or prospe...

A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any ...

Q: can someone help walk me through how I would solve this? I'm a little lost and keep getting it wrong

A: X  which represents the percent of calories will follow normal distribution. X~Norm(36,10)   The pro...

Q: In a survey of 252 professional athletes, it was found that 119 of them owned a convertible, 122 of ...

A: Click to see the answer

Q: Women athletes at a certain university have a long-term graduation rate of 67%. Over the past severa...

A: From the provided information, Population proportion (p) = 0.67 The hypotheses can be constructed as...

Q: A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of po...

A: Given two samples of number of positive statements made by participants are recorded. Number of obse...

Q: In 1961, the Child Health and Development Studies (CHDS) collected data on the births of over a thou...

A: Given Information : The historical average of mean birth weight of infants = 122 ounces. The populat...

Q: Measurements of the weights of a random sample of 400 ball bearings made by a certain machine one we...

A: Click to see the answer

Q: Psychology researchers have demonstrated that memory is usually improved by studying material on mul...

A: That is, there is no significant difference between the two study conditions That is, there is sign...

Q: A population has a mean of 84 and a standard deviation of 12. A sample of 36 observations will be ta...

A: Click to see the answer

Q: Find the mean, variance, and standard deviation of the binomial distribution with the given values o...

A: The mean of the binomial distribution is given by:

Q: QUESTION 10 What does statistical power refer to?     the ability to find equal variances...

A: The power of statistical test (1-β) is the probability that you will reject the null hypothesis when...

Q: In 1940 the average size of a U.S. farm was 174 acres. Let's say that the standard deviation was 51 ...

A: Click to see the answer