How is the alpha level related to a Type 1 error?

A random sample of n = 16 scores is obtained from a normal population with µ = 40 and σ = 8.  What is the probability that the sample mean will be within 2 points of the population 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?

What is the probability of randomly selecting a z-score less than z = 1.25 from a normal distribution.

A sample of n = 9 scores has a standard error of 6.  What is the standard deviation of the population from which the sample was obtained?

A sample of n = 9 scores is obtained from a population with µ = 70 and σ = 18.  If the sample mean is M = 76, then what is the z-score for the sample mean?

A normal distribution has a mean of µ = 70 with σ = 12.   If one score is randomly selected from this distribution, what is the probability that the score will be less than X = 55?

What is the probability of randomly selecting a z-score greater than z = 0.75 from a normal distribution?

_____ refers to the match between a child’s temperament and the environmental demands the child must cope with.  

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?