From past figures, it is predicted that 30 of the registered voters will vote in the March primary. Does this statement describe descriptive or inferential statistics?
A) Descriptive statistics B) Inferential statistics
Q. 2A survey of high school teenagers reported that 83 of those sampled are interested in pursuing a college education. Does this statement describe descriptive or inferential statistics?
A) Descriptive statistics B) Inferential statistics
Q. 3A recent report stated Based on a sample of 250 truck drivers, there is evidence to indicate that, on average, independent truck drivers earn more than company-hired truck drivers.
Does this statement describe descriptive or inferential statistics?
A) Descriptive statistics B) Inferential statistics
Q. 4Suppose you were told that the lower quartile for the annual income for doctors in the United States is 48,500. What does this mean?
What will be an ideal response?
Q. 5A _______ for a data set is a scatterplot with the ranked data values on the vertical axis and their corresponding z values from a standard normal distribution on the horizontal axis.
Fill in the blank(s) with correct word
Q. 6The scores on a midterm test in a college mathematics course were found to be normally distributed with a mean of 78 and a standard deviation of 9.
a. What percentage of students scored between 69 and 96?
b. Find the range of scores that includes the middle 50 of all scores.
Q. 7Do you believe that grain yield is correlated with the amount of fertilizer applied? If so, will the correlation be positive or negative? Explain.
What will be an ideal response?
Q. 8A coffee machine is programmed to fill a cup with a mean of 6 oz. of coffee and a standard deviation of .3 oz. Assume that the amount of fill is normally distributed.
a. What is the probability that a randomly selected cup contains between 6 oz. and 6.54 oz. of coffee?
b. What percentage of the cups filled contain more than 5.25 oz. of coffee?
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