To find the degrees of freedom of an independence chi-squared test you should take the number of rows minus 1 times the number of columns minus 1. true or false

Q: The profit for a production process is equal to $2,000 minus two times the number of units produced.…

A: Consider X is the number of units produced Here, Y = 2000-2X It is known that E(X) = 500, Var (X) =…

Q: data preparation

A: True

Q: A chi-square test for independence is being used to evaluate the relationship between two variables,…

A: Given that one variable contains 2 categories and another variable contains 4 categories. Let one…

Q: GRC students who took a Proficiency Exam had a u=84 and a=6 Find X such that 5% of the mean Exam…

A:

Q: he P-value for the Chi-square test for independence between Feeling of safety and Police district is…

A: The P-value for the Chi-square test for independence between Feeling of safety and Police district…

Q: In an avocado exporting country there is an undesirable disease in avocados. He decides to take a…

A: From the provided information, Sample size (n) = 1000 From which 204 were infected avocados.…

Q: Medical researchers want to test the theory that the viral load of Covid-19 in children is different…

A: In this problem, Medical researcher wants to test the viral load of COVID-19 is children is…

Q: state the null and alternative hypothesis.

A: here given, A lettuce grower claims that the mean weight of her heads of lettuce is 2 pounds. You…

Q: The degrees of freedom in a chi-squared test equal to the number of participants in the test minus…

A: The degree of freedom for a chi square test = n – 1 Here, n is the number of participants. And the…

Q: Not understanding how they’re getting the p value

A: Given: n=193p=number of independent variables=4R2=0.11F=5.81P-value<0.01

Q: If X ~B(190,0.34), find mean and variance of x. (Rounded in 3dp.)

A: X ~B(190,0.34) Given a Binomial Distribution X ~B(n,p) Here, n = 190 , p = 0.34

Q: A researcher wants to test three different techniques for lowering blood pressure in people who have…

A: Null hypothesis: There is no difference between means. Alternative hypothesis: There is difference…

Q: dardized exam are norma f the scores are greater th

A: The mean of the standardized exam is given as ,μ=400. The standard deviation of the standardized…

Q: The sum of squares of deviation is least if measure from а. Median b. Mean

A: the sum of squares of deviation is least when measured from ?

Q: Suppose your statistics instructor reports test grades as z-scores, and you got a score of on an…

A: The Z score is given by, Z=X-μσ,where μ=population mean            σ= population standard deviation

Q: A researcher wants to determine the sensitivity of mammograms to determine how effective they are at…

A: Solution: The below tabular information given is:   Frequency of Breast Cancer Cases Frequency of…

Q: SE T- test (one T-test T- test F- Test (Standard Error) factor/sample) (Dependent) (Independent)

A: Given : Here we have to test the claim that the variance in Group A significantly different from the…

Q: Indicate how much you agree with the statement: "OSU will beat UC in basketball the next time the…

A: The Chi-square statistic is an inferential associational procedure.

Q: You are going to convert raw scores to z scores. Convert each of these scores to a z score. The raw…

A: Given that data  8, 10, 17, 22, 6, 20, 21, 22, 19,30 Z-score =(x-mu)/sigma

Q: Suppose your statistics professor reports test grades as z-scores and you got the score of 2.33 on…

A: If X~N(µ, σ2) then, distribution of z=x-μσ~N0, 1 Provided information is, statistics professor…

Q: The degrees of freedom for this test are ________ .

A: Df=N-1 for t test  Where N =number of sample

Q: List one general strength of using nonparametric tests?

A: Nonparametric tests are used when there is no type of distribution given and a relationship or…

Q: verages the standard z value corresponding to x = 50?

A: mean = 60 s - 5 xbar = 50

Q: on a 100 item test romel got a score of 88 which is the 9th decile what does it mean

A: Di = i * (n + 1)  10 th data

Q: How do you find p-value from a chi square test?

A: The chi-square test statistic is 6.48.

Q: What combination of factors will produce the smallest value for the standard error?

A: we know that as sample size increases sample mean converges to population mean .and standard  error…

Q: Explain the purpose of the chi-square test

A: Chi square:   The Chi-Square statistic is used for testing relationships between categorical…

Q: can you find p-value?

A: Here, we are willing to test if the unemployment rate for three regions are equal or not.  The…

Q: What can you do with the ANOVA test that you cannot do with the t-test?     the ANOVA allows us to…

A: The t-test is used to check whether the two populations are statistically different from each other…

Q: Your instructor wonders which method of getting to school is faster. She records the time it takes…

A: Comments: As per the company guidelines we are supposed to answer only three subparts. Kindly repost…

Q: A church group wanted to know the most popular snack at the Wednesday night service. They wanted to…

A: N = 45 Test statistic = 1.93 p-value = 0.32

Q: Explain the Chi – Square test and when it is appropriate.

A: In simple words, You can say Chi-square test is a way to make a decision that something is random or…

Q: Find the mean squared (MSE) of n X(1) for estimating 0. error 2

A:

Q: What does the R-Squared represent?

A: Solution r is the correlation coefficient

Q: The degrees of freedom in a chi-squared test equal to the number of participants in the test minus…

A: The Given statement is False. The Degrees of freedom in a chi-squared test = (No of rows - 1) x (No…

Q: Suppose a two-way Chi-square test is used to evaluate the relationship between two variables. If…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: A population of N = 20 scores has a mean of = 10. One score in the population is changed from X = 25…

A:

Q: You take a survey that is supposed  to measure whether you are an extrovert or not. The score you…

A: Here, value of z score is 2.0 which is greater than 0.

Q: z score and p value I have my work above

A: your sample proportions are wrong From given data we have: n1=354+315=669n2=363+272=635x1=354x2=363

Q: The clinical trial for a new drug results in a p-value of 0.045. What decision should the scientists…

A: Solution: State the hypotheses. Null hypothesis: H0: The drug does not work. Alternative hypothesis:…

Q: Left tail test with Zcalc = -2.26. What is the p-value of the test?

A: The test statistic value is zcalc=-2.26, and the test is left tail.

Q: How can the Mean Value Theorem be used?

A: The Mean Value Theorem states that if a function f is continuous on a closed interval [a,b] and…

Q: For a hypothesis test of the claim that the mean amount of sleep for adults is less than 6 ​hours,…

A: Given : power = 0.4733 supporting the claim that μ<6 hours of sleep when the actual population…

Q: Explain why Rolle'a Theorem is really just an example of the Mean Value Theorem.

A:

Q: What is Chi-square test? Explain the benefits.

A: Solution

Q: Why are standard z values so important?

A: The z-score is standard score.

Q: What is the most appropriate analysis given the results on testing of assumptions? Justify your…

A: The results for testing the assumptions of normality and homogeneity of variances is provided.