Suppose we plan to conduct a study to see this is true that students gain weight as freshmen.
a) Describe a study design that would require a matched- pairs t procedure to analyze the results.
b) Describe a study design that would require a two- sample t procedure to analyze the results.
Decide which of the following statements are true.
-Normal distributions can be either symmetric or asymmetric.
-The line of symmetry for all normal distributions is x = 0.
-On any typical distribution curve, you can find data values more than 5 standard deviations above the mean.
-The x-axis is a horizontal asymptote for all normal distributions.
There're 5.2 liters of blood in an average person's system. Assume, that the variable is normally distributed. The standard deviation is 0.3. What is the percentage of people with less than 5.4 liters in their system?
The scatterplots below display three bivariate data sets. The correlation coefficients for these data sets are 0.03, 0.68, and 0.89. Which scatter plot corresponds to the data set with r = .03?
Suppose you take independent random samples from populations with means
Give the name of the distribution and any parameters needed to describe it.
The two-way table shows the results from a survey of dog and cat owners about whether their pet prefers dry food or wet food.
Does the two-way table show any difference in preferences between dogs and cats? Explain.