Which formula to use to determine the difference between two samples combined in one table at a significant level?

Which formula to use to determine the difference between two samples combined in one table at...
a researcher wishes to determine if there is systematic difference between the readings of the two digital weighing scales sample Scale A Scale B 1 50 49.9 2 82.5 82.7 3 53.8 53.8 4 85.4 85.3 5 75.4 75.4 6 63.5 63.7 7 35.8 35.7 8 25.3 24.9 use 0.05 significance level to test whether there is no significant difference between the readings of two scales. use WILCOXON SIGNED RANK TEST
* For large samples one sample t-tests (n >120) use critical t scores of ±1.96 (for 95% confidence level two tailed test) or ±1.65 (for 95% confidence level one tailed test). * For small samples (n<120) use critical t score obtained from t-distribution table. You will need to calculate degrees of freedom, which is simply the sample size minus 1 (df = n-1) and use an alpha value of .05. * For comparing means between two samples (regardless of sample...
Suppose that based on two independent samples, the 95% confidence interval for the difference between two population proportions, p1−p2 is (-0.29, -0.01). If a test of hypotheses H0: p1−p2 = 0 versus Ha: p1−p2 ≠ 0 was conducted at 0.05 level of significance based on these samples, the decision would be to .. retain the null hypothesis? reject the null hypothesis?
A student wants to determine if there is a difference in the pricing between two stores for health and beauty supplies. She recorded prices from both stores for each of 10 different products. Assuming that the conditions for conducting the test are satisfied, determine if there is a price difference between the two stores. Use the 0.1 level of significance. Complete parts (a) through (d) below. A 5.94 B 7.48 C 3.75 D 1.72 E 1.77 F 2.81 G H...
To determine if the car ownership affects a student's academic achievement, two random samples of 100 male students were drawn from the student population. The mean grade point of average of non-car owners was 2.70 with a variance of 0.36, and for a car owners this was 2.54 and 0.40. Does the data present a significant difference between the two? Use Hypothesis testing.
Two independent simple random samples are taken to test the difference between the means of two populations whose standard deviations are not known, but are assumed to be equal. The sample sizes are n 1 = 25 and n 2 = 30. The correct distribution to use is the t distribution with _____ degrees of freedom.
You may need to use the appropriate appendix table or technology to answer this question Samples of starting annual salaries for individuals entering the public accounting and financial planning professions follow. Annual salaries are shown in thousands of dollars countant Financial Planner 51.2 57.8 55.3 58.2 53.2 56.0 51.9 50.0 50.2 51.9 54.6 49.7 59.5 54.9 56.0 52.8 50.9 49.9 (a) Use a 0.05 level of significance and test the hypothesis that there is no difference between the starting annual...
A teacher wants to compare scores on a geology exam for two classes. The difference between the sample means is 21.4. If the standard deviation of the distribution of the difference between sample means is 16.66, and she is testing the hypothesis at the 68% confidence level, which statement is true? A. The difference between the two means is significant, so the null hypothesis must be accepted. B. The difference between the two means is not significant, so the alternative...
(1 point) The sample size needed to estimate the difference between two population proportions to within a margin of error E with a significance level of α can be found as follows. In the expression E=z∗p1(1−p1)n1+p2(1−p2)n2‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾√ we replace both n1 and n2 by n (assuming that both samples have the same size) and replace each of p1, and p2, by 0.5 (because their values are not known). Then we solve for n, and get n=(z∗)22E2. Finally, increase the value of...
16. A student wants to determine if there is a difference in the pricing between two stores for health and beauty supplies. She recorded prices from both stores for each of 10 different products. Assuming that the conditions for conducting the test are satisfied, determine if there is a price difference between the two stores. Use the a=0.005 level of significance Complete parts (a) through (d) below. A B с D E F G H 5.99 7.41 3.77 1.78 1.72...