for some type of questions, the DF for of slope t test is n-1, but following the instruction of the SLR, we test the intercept or slope by using DF=n-2, that makes me confuse , so when do we use DF=n-1 and DF=n-2?
for some type of questions, the DF for of slope t test is n-1, but following the instruction of the SLR, we test the int...
Question We are doing a two-mean pooled t-test. We have two samples with sizes n = 13 and n2 = 24. The population standard deviations are unknown but assumed to be equal, so we find the sample standard deviations and use them to calculate a pooled standard deviation, Sp- • For sample 1: S1 = 9.4 and 1 = 47 • For sample 2: s2 = 8.7 and iz = 44 What are the test statistic (I) and the degrees...
In C++ Write a function int * return_matches(int a[], int & size,TEST t) which returns an array (allocated off of the heap in the function) containing only the elements of array a that pass the “test” t. The function iterates through all the elements of a, and constructs a new array containing all the elements that pass the test. When the parameter corresponding to “size” is passed in (by reference), it contains the size of the array a. In the...
1. Fill in the blank. In a one-sample t-test, we use the _________ to estimate the population standard deviation in order to calculate the standard error. How do you find the degrees of freedom (df) for a one-sample t-test? a. N b. Calculate the standard deviation of the sample c. n-2 d. n-1 Which of the following influences the likelihood of obtaining significant results? a. The larger your estimated standard error, the more likely it will be to get...
Answer the following questions (1/2 point each, 4 points total): a. When should we use a t-test? b. When should we use a single-sample t-test? c. Why do we calculate standard deviation using N-1 rather than N like we used to? d. What is the standard error of the mean? e. Does it get larger or smaller as our sample size increases? Why? f. Does the critical value of t (i.e, the score you need for your results to be...
NEED HELP WITH EXERCISES 1-4
One sample t Test we are mow going to use Excel to test a l it the average cholesterol level of patients in in cholesterol level of 20 random people from vario on one given sample We would like to know to 200 and for shat reason we collec or patients in intens based n various intensive care units Cholesterol level 1S4, 168, 134,201,208,220.225,228,201207,168,211,203,254,268198 out our data in colurmn A. In Cells A3 A22 we...
You have a sample size of N = 20. You will perform a one-tailed t-test with alpha = .05. You have looked up the critical value and it is -1.73. You have calculated t-test statistics of -1.41. Which of the following is correct? Reject the null or retain the null? You have a sample size of N = 37 and you are going to perform a one-sample t-test using alpha = .05. You go to the t-table and find that...
1. Calculate a regression equation using Anxiety as the predictor
and Test Score as the predicted variable. What is the slope?
2. Which is an interpretation of the slope?
3. Using the same regression, what is the y-intercept?
4. Which is an interpretation of the y-intercept?
5. Use the regression equation to predict a Test Score for
someone with an Anxiety level of 6.
StudyTime Anxiety Die Roll Test Score Commute Class ID# 10 Senior Freshman Junior Senior Freshman Junior...
1. Suppose we take a sample from two separate populations and record some quantitative measurement for both. The first sample contained 60 respondents and resulted sample mean of 103 with a sample standard deviation of 8.2. The second sample contained 75 respondents and resulted sample mean of 100 with a sample standard deviation of 7.56. Using this information, our goal is to test: H0: μ1-μ2 = 0 Ha: μ1-μ2 > 0 What is the test statistic, t, for this example?...
IN EXCELL
We are now going to use Excel to test a hypothesis based on one given sample. We would like to know if the average cholesterol level of patients in intensive care is equal to 200 and for that reason we collect cholesterol level of 20 random people from various intensive care units. I Cholesterol level 154,168,134,201,208,220,225,228,201,207,168,211,203,254,268,198,298,135,154,189 We put our data in column A. In Cells A3-A22 we type our data and in cell Al we type Cholesterol. First...
5. (20 pts) Suppose that we have a dataset {(yi, x, Tt2, X;3), i,1,... ,n} together with some general belief on the data that higher (lower) value of each covariate x; (j = 1,2,3) will tend to result in higher (lower) y. In this study, we are interested in predicting y; from the total set of the regressors x;i, X;2, xt3. So, we apply the multiple linear regression yi = Bo+B1x1 +B2x52 + B3x43 + t to the data and...