Chapter 7

Question 1

point estimate

Answer 1

single value used to estimate a population parameter

Question 2

confidence interval

Answer 2

range of values used to estimate population parameter

Question 3

minimum sample size

Answer 3

minimal sample size needed to estimate population parameters

Question 4

confidence level

Answer 4

probability that the confidence interval has captured the population parameter

Question 5

3 phases of conclusions

Answer 5

I. interpret the confidence level
II. state the question
III. answer the question

Question 6

requirements for estimating a population proportion

Answer 6

1. sample must be a simple random sample
2. conditions for a binomial distribution must be met
3. at least 5 successes and 5 failures

Question 7

formula for finding minimum sample size

Answer 7

n=[z alpha/2]^2(p^)(q^)/E^2

Question 8

Z alpha/2=

Answer 8

invNorm(1-alpha/2, 0, 1)

Question 9

t distribution

Answer 9

used when the standard deviation is unkown

Question 10

formula for a t distribution

Answer 10

x̅ -μ/(s/√n)

Question 11

requirements for estimating population mean with an unknown standard deviation

Answer 11

1. must be simple random sample
2. original population must be normally distributed
   AND/OR
3. sample size>30