Mark Biagi 4/1/10 Topics 14-15
Activity 14-5 A. It looks approximately normal although it is a little skewed to the right. B. The plot shows that the data is roughly normally distributed, although there is a bit more data on the right tail than the left t
Mark Biagi Homework #7
Activity 16-8 A. The number of essays required for a confidence interval of 99% is .01=2.576(square root of (.15)(.85)/n. Solving for the equation n = 8461. B. Two ways to accomplish this would be to use a lower confidence interval
Sampling Bias- When a sampling method regularly under represents some segment of the population and over represents others. Observational Study- researchers record data from subjects without interfering in subjects' actions or choices conclusions about ca
Chapter 1
Variability the phenomenon of a variable taking on different values or categories from observational unit to observational unit Categorical this variable records a group designation, such as gender Chapter 3 Sample size the number of observation
MarkBiagi 4/20/2010 Homework8
Activity197 A.A95%confidenceintervalforfemalesis(97.9315to98.2778).A95%confidenceintervalfor malesis(98.2096to98.5781). Females
Estimate of BodyTemps Estimate Mean Estimate of BodyTemps Estimate Mean Attribute (numeric): Bod
Mark Biagi Homework #10 Topics 26/27
Activity 26-8 B. The relation should be strong and negative because the farther north you travel the colder it is in January. D. The relation should be strong and positive because bigger sandwiches tend to have more ca