The probability of Leon getting a speeding ticket this year is 0.8, and the probability of him getting a second speeding ticket given that he already has one this year is 0.9. What is the probability that he will get two tickets this year?
A) 0.8 B) 0.72 C) 1.70 D) 0.9
Q. 2If the mean of a set of raw data is subtracted from each of the numbers, the mean of the new set of data is
_______
.
Fill in the blank(s) with correct word
Q. 3Aggressiveness A recent study evaluated elementary age children for aggressiveness. This study found that the children who played video games were more likely to engage in aggressive or violent play at school.
The researchers said the difference was statistically significant.
a. Briefly explain what statistically significant means in this context.
b. The news media reported that this study proved that playing computer games causes children to be aggressive or violent. Briefly explain why this conclusion is not justified.
c. But perhaps it is true. We wonder if playing computer games can lead to aggressive or violent behavior in elementary school children. We find 50 young children whose families volunteer to participate in our research. Design an appropriate experiment. (You need not explain how to randomize.)
Q. 4If paired data plotted on log-log paper fall close to a straight line, we would expect a parabola to provide a
good fit for the data.
Indicate whether the statement is true or false
Q. 5__________ occurs when those conducting a survey or study are unable to obtain data on all experimental units in the sample.
Fill in the blank(s) with correct word
Q. 6In an F ratio for a one-way ANOVA, the numerator degrees of freedom is __________ .
Fill in the blank(s) with correct word
Q. 7A class mark is defined as the average of _______ .
Fill in the blank(s) with correct word
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