z Tests and Intervals
... of cars had a sample average GPA of 2.70 and a known population variance of 0.36. The n = 100 car owners had a sample average GPA of 2.54 and population variance of 0.40. Do the data present sufficient evidence to indicate a difference in the mean achievement between car owners and non-owners of car ...
... of cars had a sample average GPA of 2.70 and a known population variance of 0.36. The n = 100 car owners had a sample average GPA of 2.54 and population variance of 0.40. Do the data present sufficient evidence to indicate a difference in the mean achievement between car owners and non-owners of car ...
Sampling Distributions
... 1. The newspaper records the sample proportion who favors the candidate. What is the approximate sampling distribution of the sample proportion? (i.e., what is the name of the distribution, and what are its mean and standard deviation?) Hint: Look at the notes on “Sampling Distributions for Sample ...
... 1. The newspaper records the sample proportion who favors the candidate. What is the approximate sampling distribution of the sample proportion? (i.e., what is the name of the distribution, and what are its mean and standard deviation?) Hint: Look at the notes on “Sampling Distributions for Sample ...
10.2
... your calculator to give you your answers – you must report what they report as df or you will get it wrong. If you do what we normally do (n-1) then you have to keep what the formula gives you…not what the calc. gives! ...
... your calculator to give you your answers – you must report what they report as df or you will get it wrong. If you do what we normally do (n-1) then you have to keep what the formula gives you…not what the calc. gives! ...
Estimating with Confidence
... density curve: symmetric about 0, single peaked, and bell-shaped. The spread is a bit wider giving more probability in the tails and less in the center. (More variation is present when using s in place of σ. As the df* increase the density curve gets closer and closer to N(0,1)). *A new term must be ...
... density curve: symmetric about 0, single peaked, and bell-shaped. The spread is a bit wider giving more probability in the tails and less in the center. (More variation is present when using s in place of σ. As the df* increase the density curve gets closer and closer to N(0,1)). *A new term must be ...
here
... a. Estimate the probability distribution of the number of male children, say X, in these families using these data by calculating proportions. b. Find the expected value of X. c. Find the variance of X. d. Find the probability distribution of p̂ , where p̂ is the proportion of children in each famil ...
... a. Estimate the probability distribution of the number of male children, say X, in these families using these data by calculating proportions. b. Find the expected value of X. c. Find the variance of X. d. Find the probability distribution of p̂ , where p̂ is the proportion of children in each famil ...
