Professor Hayashi wants to see if a new Canvas Homework system has an effect on how well students perform on Exam 2. The Exam 2 mean for all students who have ever taken his statistic course  is 77.2. He collects data from a sample of 9 students who use the new Canvas Homework system.  He finds the Exam 2 mean for this sample is 81.7 with a variance of 32.49.   What is the effect size using Cohen's D.

Q: If the standard Z value of a random Ferdin drawn from a normal distribution populason with an…

A: Given  Mean=mu=80 Variance=sigma^2=400 Z=1.2

Q: Answer the following questions without making any calculations: a) A researcher measures weights of…

A: a)Rat B has a more variant weight. Reason:The length of the confidence interval is twice the margin…

Q: To compare the effectiveness of two kinds of bumper guards, two independent random samples of six…

A: Given: Sample average: x¯1=1440x¯2=1490 Population variance: σ12=3632σ22=2020 Sample size :n1=n2=6 X…

Q: The two types of variance that can occur in our data are A. Independent and dependent

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: Suppose a population has three values 13, 17 and 24. What is its variance?

A: Given: n=3 The mean of the data is obtained as below: Mean=∑xn=13+17+243=543=18 The mean is 18.

Q: In a certain population, the mean price of the stock prices was 230, the median was 262, the…

A:

Q: To obtain a maximum amount of variance, an item ought to have a degree of difficulty of what?

A: To obtain a maximum amount of variance an item ought to have a degree of difficulty is the number of…

Q: A researcher claims that the variance of the heights of all female college basketball players is…

A: From the provided information, The claim is that the variance of the heights of all female college…

Q: The weight distribution of 100 NSU students is normally distribution with mean 70 kg and variance 2…

A: Given that mean is 70 kg and variance is 2 kg. That is,  μ=70σ2=2 i) Consider,…

Q: 1. Which of the following is consistent with the alternative hypothesis for the interaction of…

A: option d) is correct. The mean differences between treatment conditions are not what would be…

Q: Which of the sections had the most variance in the scores?

A: Given: Section Mean Standard deviation English 20.3 6.8 Math 20.7 5.4 Reading 21.4 6.5…

Q: he following table shows the results of an analysis of variance comparing three treatment conditions…

A:

Q: shiela is a big fan of foxes and has studied the weight of young foxes of a certain type at birth.…

A: Given:n1=15, x1=1.23, s12=0.3n1=15, x2=1.13, s22=0.4   1)To test:H0:μ1-μ2=0H1:μ1-μ2≠0

Q: A new material is being tested for use in the manufacture of electrical conduit, to determine…

A: Here, the crushing strengths are measured for a sample of size 16 of the old material and a sample…

Q: The accompanying data table lists results from car crash tests. Included in results from car crash…

A: Categorical variable: The variable that consists of the attributes and has different categories,…

Q: It is investigated whether there is a difference between the statistics course final exam scores of…

A: The appropriate hypothesis to be tested is as follows here the square of S_1 and S_2 represent the…

Q: If a set of data is normally distributed with a mean of 20 and a variance of 16, a z-score of -3.8…

A: Let raw score is X.  Then Z Score is given by, Z= (X- mu)/sigma Where mu is mean  And sigma  is…

Q: The amount of chlorine in 100 cm3 water taken from a water tank was measured, the average was 2.15…

A: A test based on a large sample is called a large sample test. For a large sample, the sample size…

Q: The accounting department analyzes the variance of the weekly unit costs reported by two production…

A: See the handwritten solution

Q: what happens to the F-statistic if two variances are different?

A: The two variances are different hence the F-statistic are as follows,

Q: The blood pressure and weight of Jellystone Park bears are correlated with and .6 is the correlation…

A: The provided information is: Average blood pressureY¯=150 A variance of blood pressureσ2y¯=100 The…

Q: What is the variance of the following data( 1, 2, 3, 4, and 5)?

A: According to the given information in this question We need to calculate the value of variance

Q: An analysis of variance differs from a t test for independent means in that an analysis of variance…

A: An analysis of variance differs from a t test for independent means in that an analysis of variance…

Q: A group committed to quality television has been concerned about a new talk show. For two weeks,…

A: We first find the meanmean=342+267+321+157+33+349+254+166+132+289 10=231 Then we make a table…

Q: The purchase value of transactions at a grocery store is normally distributed with a mean of $244…

A: Consider X be a random variable which follows normal distribution indicates the purchase value of…

Q: use iMessage while the other half only use What's App. For the individuals who only used iMessage,…

A: Given  iMessage ; n1=40 , average=280 , Sample variance=170 What's App; n2=40 , average=295 , Sample…

Q: The weight of certain mushrooms are normally distributed with a mean of 12g and a variance of…

A: Given data :

Q: Use the following information to answer the question. A researcher wants to study different…

A: Given  A researcher wants to study different messaging platforms by collecting data on 40…

Q: A correlation of +.20 means that [blank] of the variance in the outcome variable is accounted for by…

A: Solution: From the given information, r=0.20.

Q: Based on your understanding of how we calculate an ANOVA, what type of variance is most important to…

A: ANALYSIS OF VARIANCE (ANOVA)                   Analysis of variance (ANOVA) is a…

Q: The    is that at least one of the population means is different from another (in other words, there…

A: The alternative hypothesis is that one population mean is different from another (in other words,…

Q: If the correlation is .8, then 40% of the variance is explained?

A: The given statement is incorrect.

Q: ition, you discover that the prices of imports and exports have a correlation of r = -0.40. The…

A: *answer:

Q: Mr Chimbukutu, owner of a bakery said that the average weekly production level  of his company was…

A: We have given that  Mean(µ) = 11398 Standard deviations (σ) = √ 49729 = 223

Q: Suppose that a journal article reports that the mean age at marriage of Filipino women is 22.6 years…

A: Given Data : For Sample 1 x̄1 = 22.6 σ1 = √7.2 = 2.6833 n1 = 150 For…

Q: Compared to an independent-measures design, a repeated-measured study is more likely to find a…

A: From the given information, Independent –measure design: An independent measures design is a…

Q: If other factors are held constant, increasing the sample variances will have very little influence…

A: Effect size : The size of the effect indicates how significant the association between variables or…

Q: Use the following information to answer the question.  A researcher wants to study different…

A: We have to test that if there is difference in two groups and we have to determine the null…

Q: The population variance of the data set provided below is 19. Find k. 1.3k 1.6k 2.2k 2.9k 3.5k…

A: We know the formula to Variance is given by, Variance= E(X2) - (E(X))2 Where E(X2) = (summation…

Q: To compare the effectiveness of two kinds of bumper guards, two independent random samples of six…

A: n1=6, x¯1=1440, σ12=3632n2=6, x¯2=1490, σ22=2020α=0.05

Q: A certain producer of chocolate has some problems with the variability of five suppliers of cocoa.…

A: Given information: k=5Minimum detectable effect=3.5 unitsσ2=2.5 unitsα=0.05

Q: In a comparison between the mean waiting time of the patients in the hospitals of Giza and…

A: 1.   The 95% confidence interval for the difference between the average waiting time in Giza and…

Q: If, in an analysis of variance, you find that MSTR is greater than MSE, why can you not immediately…

A: While performing Analysis of Variance (ANOVA), we calculate the test statistics which is the ratio…

Q: A traffic officer suspects that the mean number of car accidents every week is 4. A sample of 16…

A: Given,  n = 16 μ = 4x¯ = 7σ = 4α = 0.05

Q: Suppose you analyzed the average monthly credit card bill of Visa credit card customers using two…

A: Question 2: Sample statistics of the two samples:The given statistics for the two randomly selected…

Q: A researcher designed a study to test whether caffeine use enhanced performance time to run a 100…

A: t-test: If the given sample size is less than or equal to 30 then that is a small sample test.…

Q: Within the MedTech Department, students were randomly assigned to one of two Biostatistics teachers…

A: Given that, n1 = 30 n2 = 25 x¯1=82.5x¯2=83.9 s12=80s22=125

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.