A sample obtained from a population with σ = 48 has a standard error of σM = 6. How many scores are in the sample?

Calculate the Variance using the following information: EXi = ΣΧ2 = n 32.3 413.8 18 Round your answer to the nearest hundredth. (Place your answer in the box below)

An experiment was conducted to determine whether giving candy to dining parties resulted in greater tips. The mean tip percentages and standard deviations are given in the accompanying table along with the sample sizes. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b). OA. Ho: H₁ H₂ H₁: H₁ H₂ OC. Ho: H₁ H₁: H₁ C a. Use a 0.05 significance level to test the claim that giving candy does result in greater tips. What are the null and alternative hypotheses? H₂ H₂ No candy Two candies B. Ho: M₁ = H₂ H₁: H₁ H₂ D. Ho: H₁ μ H₁ H₂ H₂ H₁: M₁

A sample of n=4 scores has ΣX=8 and ΣX2=40. What is the value of the sample variance, s2?​