Which of the following are requirements of a random sample? (Select all answers that apply)

Which of the following is NOT always a step for using a Unit Normal Table?

Find the standard error for a sample mean with n = 20 and σ = 6.28.

A researcher wants to increase her statistical power. She can do this by ______ her sample size or using a _____ – tailed test.

If I conduct an inferential test and reject the null hypothesis, what is the appropriate sign to use for the p-value in the plain English interpretation?  That is, p ____ .05

If Luc was picking from a bag of candies with an equal number of lemon, blueberry, strawberry, banana, and coconut flavored candies, what is the probability of him randomly selecting a strawberry flavored candy?

What proportion falls below z=1.78 but above the mean?

A normal distribution has µ = 80 and σ = 10.   What is the probability of randomly selecting a score greater than 90 from this distribution?

Hidalgo, eight, is very good at addition and subtraction, but he has a hard time understanding the complex algebraic problems that his 14-year-old sister does. Hidalgo is currently in which of Piaget’s stages of development?  

In the Strange Situation, Quentin cries mildly when his caregiver departs; however, he is happy upon reunion, and then continues to explore once the caregiver has returned. He would be classified as: