Why is there more variation in the possible values of the studentized version of x¯than in the possible values of the standardized version of x¯?

Q: when is a dummy variably useful?

A: Dummy variable: This is an artificial variable which indicates more than or equal to two categories…

Q: In the 1980s, a research study linked drinking coffee to a higher risk of heart disease and pancreat…

A: Introduction: A confounding variable in a study is a variable that is not acknowledged or controlled…

Q: A national health survey weighed a sample of  530  boys aged  6 - 11  and found that  78  of…

A: Given : Claim : The proportion of boys who are overweight is greater than the proportion of girls…

Q: If the 95% Cl for the variable "Party Identification" includes zero, this variable is statistically…

A: We have given the statement about the party identification

Q: What  statistical test( from the data)  should be used to check whether people choose each type of…

A: Chi-square goodness of fit test: The Chi-square goodness of fit test is used to test whether or not…

Q: The median number of part-time employees at fast-food restaurants in a particular city was known to…

A: The median number of part-time employees at fast- food restaurant is 18. There are 7 fast-food…

Q: Illustrate the Test R2 for significance?

A: Coefficient of determination: The coefficient of determination (r2) is the percentage of total…

Q: What is the difference between the (Simple) Power Rule and the General Power Rule?

A:

Q: Explain the consequences of failing to properly account for multiple comparisons

A: Multiple comparisons tests (MCTs) are performed several times on the mean of experimental…

Q: What does it mean to say that two variables are positively​ associated? Negatively​ associated?

A: Association: The association of how two varaibles are connected with each other. It decides how one…

Q: I want a 99% confidence within 2% for the true proportion of bald people in the US.  How many people…

A: Given that, Margin of error E=0.02 Confidence level is 99% Critical value: The two tailed z critical…

Q: A study using the chi-square test of Independence has 3 categories of one variable and 2 categories…

A: Given that the one variable has 3 categories and the other variable has 2 categories.

Q: tudy using the chi-square test of independence has 4 categories of one variable and 3 categories for…

A: For the chi-square test, the degrees of freedom can be calculated as: Degrees of freedom = (r - 1) x…

Q: What is Multiple Comparisons?

A: In statistics and probability theory, Multiple Comparisons (also known as multiplicity or multiple…

Q: No, less likely

A:

Q: One disadvantage of a between-subjects design is differences between the participants in the…

A: Between Subjects design: Between-subject design is such a design in which different subjects are…

Q: A population has a stand. dev. of 24. on average, how much difference should there be between the…

A:

Q: Why t Test Not Appropriate?

A: t Test is the statistical parametric test which is used to compare the means of the population. It…

Q: A study using the chi-square test of independence has 4 categories of one variables and 2 categories…

A: We have given that  4 categories of one variables=r 2 categories for its other variables=c

Q: A man has an adopted grandson. After examining him at his 2-year checkup, the boy's pediatrician…

A: For a variable, X~N(μ,σ2), the z-score is, Z=X-μσwhereμ=population meanσ=population standard…

Q: Explain the reasons why we might have positive, negative z_scores? When is the z_ score equal 0

A:

Q: EXPLAIN WHAT A RELIABILITY COEFFICIENT IS AND WHAT A COEFFIENT OF 0.90 MEANS.

A: we have to discuss about reliability coefficient

Q: Describe the four cases of the Leading Coefficient Test.

A: Let given polynomial function is fx=anxn+an-1xn-1+an-2xn-2+......+a2x+a1x+a0 The graph of given…

Q: What is the power of a test?

A: Power of test is the probability of rejecting the null hypothesis when it is false. Therefore, the…

Q: A random sample of 180 men who took the driving test found 103 passed. A similar. sample of 225…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: data has extreme scores, what is the best measure of average?

A: The mean is the average value of the data set. It is calculated by summing up all the observations…

Q: What does it mean to say the race was too close to call?

A: Here Given  Proportion vote A would receive = PA=0.46 Proportion vote B would receive=PB=0.44…

Q: What is the weakness of p value approach?

A: p-value is basically the probability that the null hypothesis is false. Interpretation: If p-value…

Q: a) Mr. Kashif got an average of 50 in 6 tests. What should he get in the next test to obtain the…

A:

Q: What is the discrimination coefficient?

A: Discrimination coefficient

Q: What is the value of ΣX2 for the scores 2, 4, and 5?

A: The scores are given as 2, 4, and 5.

Q: What is the correct decision for a test of the difference in two proportions if the test statistic…

A: It is given that the test statistic is 1.99.

Q: Explain why the use of a level of significance of 5% is not best in all circumstances.

A: There are two types of error, which are as follows Type I : Reject the null hypothesis when it is…

Q: What is the VaR Controversy?

A: VaR controversy in football keep proving that technology may not be the saviour. VaR offside…

Q: What is the power of this test?

A: Let X denote the weights of donuts. Decision rule : Reject the null hypothesis if the donut weights…

Q: If the p-value of a test is 0.022. what is your decision?

A: For making conclusion about null hypothesis Ho we compare p-value and level of significance.

Q: When we say a study revealed a “difference in differences”, it means the independent variables…

A: Introduction: Main effect: Main effect is a simple effect of an independent variable on the response…

Q: Explain The concept of differentiability?

A: Differentiability: Let f(x) be a real-valued function defined on an open interval (a, b) and let c…

Q: Explain how the formula of finding the x-value of the corresponding z-score was formed.

A: The outcome of a random experiment is called random variable. And z-score is the standardized value…

Q: What are the two types of incorrect decisions?

A:

Q: what is the indepedent variable and dependent variable in this question " Why does Los Angeles…

A: Independent variable refers to the variable which does not alter with the change in other variable.…

Q: The male population of u.s.a is 250 lakh. The number of literate males is 20 lakh and the total…

A:

Q: If the test result is significant at 5% level, it must also be significant at 1% level.

A:

Q: what are the reasons to include omitted variables?

A: Introduction: Omitted variable bias: We have considered the omitted variable bias in case of a…

Q: You believed that sending positive thoughts to your classmates that have been so much bothered with…

A: The data represents the grades of classmates before and after bunch of thoughtful messages are sent…

Q: Which is the correct output (B or C) for the appropriate test? Explain.

A: A student compared organic food price at Grocery1 and Grocery2 here we use Paired t-test for…

Q: Explain why there is more variation in the possible values of the studentized version of x than in…

A:

Q: what does it mean when a patient is censored?

A: Censoring is said to be present when information on time to outcome event is not available for all…