Week 10

Question 1

symmetric, bell-shaped curve with a single peak corresponding to the mean, width determined by standard deviation

Answer 1

normal distribution

Question 2

rule that states what percentage of data values lie between 1, 2, and 3 standard deviations of the mean (respectively) in a normal distribution

Answer 2

68-95-99.7 rule

Question 3

number of standard deviations a value lies above or below the mean

Answer 3

standard score (z-score)

Question 4

percentage of all values in a data set that are less than or equal to a value

Answer 4

percentile

Question 5

term for when the difference between what is expected and what is observed is too great to be explained by chance alone

Answer 5

statistically significant

Question 6

number that describes something about an entire population

Answer 6

population parameter

Question 7

states that the distribution of proportions from many samples of the same size is approximately a normal distribution

Answer 7

central limit theorem

Question 8

distribution consisting of proportions from many individual samples

Answer 8

sampling distribution

Question 9

percentage representing degree of likelihood that data contains true value of the population parameter

Answer 9

confidence interval

Question 10

starting assumption for a hypothesis test, asserting that there will be no special effect or difference and results will be the same as usual

Answer 10

null hypothesis

Question 11

claim that the population parameter will have a different value from that claimed by the null hypothesis after a hypothesis test

Answer 11

alternative hypothesis