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A random survey of a small group of high school students collected information on the students' age and number of bookd they had read in the past year.
Age(years) 16 15 18 17 16 15 14 17
Books read 5 3 8 6 4 4 5 15
a. create a scatter plot of the data
b. COmpute the Pearson corelation
c. Determine the equation of the line of best fit.
d. Identify outlier
e. Repeat part d with the oulier removed. DOes this improve the linear model?
f. Do your results suggest that the number of books a student reads depends on the students age?
Test, at the significance level of 0.05, whether the mean bacteria count for the plant discharge exceeds that for the upstream location.
sample methods identify which of the following applies simple random systematic conveniencestratified or cluster sample
A share tipping service claims that its selections give an average return of 10% if held for 12 months. An investor wants to investigate this claim and records the returns of the last 20 shares that have met the 12 month period.
He continues this until he draws a number that is less than the comparison value, at which point he continues his interrogation. If he draws a 3 as the comparison value, what is the expected number of lashes you will receive for that question?
Epidemiologists are researching the relationship between two levels of tobacco exposure and a positive diagnosis of esophageal cancer. With SPSS, use the data set bd1.sav and the variables tob2 (dichotomized smoking status)
your chemistry professor last semester lost your final exam. he therefore used your total points earned prior to the
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution with a population standard deviation of $4.
What does the * represent in a boxplot? How many * are there for the variable Book Cost? What are the outlier values? What is the 5-number summary for Book Cost?
suppose that the probability is .3 that any given citrus tree will show measurable damage when the temperature falls to
4. Although most of us buy milk by the quart or half gallon, farmers measure daily production in pounds. Ayreshire cows average 47 pounds of milk a day with a standard deviation of 6 pounds. For Jersey cows, the mean daily production is 43 pounds wit..
suppose that a group of 1000 orange trees is laid out in 50 rows of 20 trees each. to determine the sugar content of
In playing the Lemonade Stand Game, Bob decreased his price per cup by two cents, from $.27 per cup to $.25 per cup. At the .05 level of significance, did net revenue increase?
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