he following is a set of hypotheses, some information from one or more samples, and a standard error from a randomization distribution. Test H0 : μ=85 vs Ha : μ>85 when the sample has n=19, x¯=82.2, and s=3.6 with SE=0.8. Find the value of the standardized z-test statistic. Round your answer to two decimal places.

A researcher wants to know if peoples standardized test performance is influenced by what they are wearing. They ask 16 ppl to take the SAT while wearing their best professional outfit. 6 months later they have the same 16 ppl take the SAT while wearing a bathing suit.  What test would you use and why? (z test, independent t test, single sample t test, paired samples)

Assume that you have a binomial experiment with p= .3 and a sample size of a 100. The value of the variance is?

-what kinds of questions can we test with a t test? -How do you know if two samples are statistically different from each other? In other words, what statistics will tell you if your results are statistically significant?

You may need to use the appropriate technology to answer this question. In a completely randomized design, 15 experimental units were used for the first treatment, 17 for the second treatment, and 20 for the third treatment. Complete the following analysis of variance. (Round your values for MSE and F to two decimal places, and your p-value to four decimal places.) Source of Variation Sum of Squares Degrees of Freedom Mean Square F p-value Treatments 1,100         Error           Total 1,800         At a 0.05 level of significance, is there a significant difference between the treatments? State the null and alternative hypotheses. H0: ?1 = ?2 = ?3Ha: ?1 ≠ ?2 ≠ ?3H0: ?1 ≠ ?2 ≠ ?3Ha: ?1 = ?2 = ?3     H0: At least two of the population means are equal.Ha: At least two of the population means are different.H0: Not all the population means are equal.Ha: ?1 = ?2 = ?3H0: ?1 = ?2 = ?3Ha: Not all the population means are equal. Find the value of the test statistic. (Round your…

At a 0.05, test to see if the population variances from which the following samples were drawn are equal. The test statistic is Group 1 n₁ = 21 Group 2 n₂ = 19 $1 = 20 S2 = 18 (A) 1.56 (B) 1.23 (C) 1.26 (D) 1.11

You are conducting a study to determine if there is a significant difference between typical salaries of surgeons and stock brokers (in thousands of dollars). Calculate the test-statistic, t with the following sample data.n1=20 x¯1=163, s1=4n2=50, x¯2=162, s2=9 Round to 2 decimal places