If the t-statistic for a variable is -1.74, is the variable statistically significant?   No   Yes

Q: When do you need to calculate and use a Z - Score? What are the assumptions when you use a Z score?

A: We have to find need of calculate and use of z score..

Q: What is the relationship between percentiles and quartiles? Interpret Q1, Q2, & Q3 as percentiles.…

A: Hello. Since your question has multiple parts, we will solve first question for you. If you want…

Q: What is the conclusion about the t-statistic and the p-value?

A: Decision rule: If p-value ≤ α, then reject the null hypothesis. Otherwise, fail to reject the null…

Q: z = 1 is what percentile?

A: It is given that z =1.

Q: If the t-statistic for a variable is -1.74, is the variable statistically significant? No Yes

A: Given: Test statistic is -1.74

Q: mean IQR closer to farther from The Week 2 data values tend to be. 5. their median than the Week 1…

A: Week 1 Median =14.5 IQR = 1.15   Week 2 Median =16 IQR = 1.5

Q: hat is the possible range of values for Pearson's coefficient of skewness?

A: Here  For Perason coefficient of Skewness

Q: C8. In Exercise 1, you found that more women than men are likely to fear walking alone in their…

A:

Q: (a) Show that 2X is also an unbiased estimator of B. the properties of sample mean,

A: Given:  Random variable x with mean (beta/2)  Then to show that "2*xbar" be  the unbiased estimate…

Q: Can you help me determine the test statistic and P-value of the following equation?

A: Hypothesis testing plays a major role in research and development. To diagnose the underlying cause…

Q: If the absolute value of a t-statistic is greater than t-critical, what should we do ?

A: Solution: Rejection rule for the two-tailed test: If the test statistic is greater than the critical…

Q: The data for an independent –measures research study produced a sample mean difference of 6 points…

A: Following information is given:

Q: Your instructor has the Mid-Term examination grades. He told you that the 25th percentile is 51 and…

A: Given that, Your instructor has the Mid-Term examination grades. He told you that the 25th…

Q: If you chose to compute a mean for a variable, which measure of variability would you most likely…

A:

Q: What is the decision rule for the t-test that the mean child mortality rate for countries in Eastern…

A: It is tested that the mean child mortality rate for countries in Eastern Europe is more than the…

Q: Would a sophomore year statistics class students’ average age be a good Point Estimator(This is a…

A: Yes, as usually students in sophomore year are of certain age and the age range is not so huge,…

Q: In 1995, the proportion of all mutual funds that beat their benchmark indices was .42. In 2002, a…

A:

Q: Test the claim that the mean GPA of night students is larger than 2.8 at the 0.05 significance…

A: Claim : The mean GPA of night students is larger than 2.8 Sample size n = 35 Sample mean M = 2.81…

Q: The average student studies eight hours for a statistics exam and receives a grade of 84. In a…

A: Given that, Claim: Test the hypothesis that the studying twelve hours statistically significantly…

Q: The scores in a high school are normally distributed with a variance of 225. Suppose that 27.43% of…

A: Normal Distribution: A continuous random variable X is said to follow Normal distribution with…

Q: You are testing the difference between a sample mean and a population mean in a one-tailed test that…

A:

Q: 2. Calculate your t-statistic.

A: We have given that  Sample mean = 88 Population mean = 85 Sample standard deviation = 7 Sample size…

Q: After the analyses, Rosalind found a significant difference in test scores between taking the test…

A: The results are different because it is likely that the test statistic value obtained by Rosalind is…

Q: When results from a scholastic assessment test are sent to test-takers, the percentiles associated…

A: Given: 99th percentile  for their verbal grade

Q: How does having leather seats affect the expected price of the car, controlling for the mileage and…

A: Let us construct the regression equation by using the coefficient. price = 6953 - 0.0841*Mileage +…

Q: 2.What does a x score of - 1 for a data value x represent

A: Given: z-score=-1

Q: When do you need to calculate and use a Z - Score?

A: Z - score :  A z-score describes the position of a raw score in terms of its distance from the mean,…

Q: Explain how we use t as an inferential statistic

A: Inferential statistics:The process of making conclusions regarding the population based on the…

Q: The athletic director at a large university compared the proportions of freshmen (1st year students)…

A: The hypothesis is, Null hypothesis: H0: There is no difference between proportions of freshmen and…

Q: X is a normal variable with mean of 8 and variance of 97. What is the z-score when x = 3?

A:

Q: A researcher wants to test if elementary school children spend less than 30 minutes per day on…

A: Given claim is A researcher  wants to test if the elementary school children spendless than 20…

Q: Suppose you are conducting a paired t test to determine whether or not caffeine has an effect on…

A: d = B- A

Q: How is a z-score obtained? What is the interpretation of a z-score? An observation has a z-score of…

A: We have to give formula and interpretation of z score.

Q: the statistic X defined as X = 49S 2

A: (a) chi-square distribution with 49 degrees of freedom

Q: An investigator is using a chi-square test to compare the proportion of patients with a successful…

A: It is given that 25 subjects were given 4 treatments. Here we will take alpha=0.05 We need to find…

Q: What are the Four Steps to use when working with the t-test ?

A: The Four Steps to use when working with the t-test with p-value approach is given below: Step 1:…

Q: When would you use a chi-square analysis A.When the variance between two groups are equal B. When…

A: C. When you only have categorical variables to analyze

Q: In the past, a chemical company produced 880 pounds of a certain type of astic per day. Now, using a…

A: Claim: The mean daily yield for the new process is less than that of the old procedure.

Q: Use a T-test of the data given in the picture, compare it with a P value(one tailed) and do a…

A: The three pairs Male and Female, Male and Male and injected male and male, and objective is to apply…

Q: Is there a significant relationship between income and the level of work adjustment of the…

A:

Q: Pat took three exams. In Mathematics, her grade was 75, the mean was 90, and the standard deviation…

A: From the provided information, In mathematics, mean (µ) = 90 Standard deviation (σ) = 15 Pat grade…

Q: 1. What is the difference between the t-statistic you calculate from your sample and teritical that…

A: We have given that the statement about t-statistic calculated from the sample and t-critical value…

Q: State the empirical rule for variables.

A: The empirical rules for variables are as follows:68% of all possible observations lie within one…

Q: When will a chi-squared statistic equal zero? You need to very specifically discuss the data.

A: Generally, the chi-squared statistics are always related to the null hypothesis of given data. When…

Q: What is the value of the t-statistic of the constant?

A: It is given that Coefficient of constant = 5.439236 Standard error of constant = 0.7981253

Q: population is normally distributed with a mean of µ = 145 and σ = 20. Which is the percentile rank…

A:

Q: hours. Is there a significant difference between the average life of all of the manufacturer's…

A: here from given information  sample mean  =  24.3  sample size  = n = 35  population standard…

Q: Briefly describe a health-related situation in which you would want to use the t test for dependent…

A: Solution: It is needed to explain the paired t test using health related situation.