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A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following:
a) What scores fall between -1 and +1 standard deviation?
b) What percent of all scores fall between -1 and +1 standard deviation?
c) What score falls at +2 standard deviations?
d) What percentage of scores falls between +1 and +2 standard deviations?
If 900 users visited the site, would the probability that more than 250 of them click on an ad be higher or lower than the answer found in part
You have a standard deck of cards and you take out 2 cards at random. Let Y1 represent the number of red Queens in your sample and let Y2 represent the number of spades in your sample.
A researcher wished to estimate the number of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4%.
Is there evidence of difference in mean life of bulbs produced by the two kinds of machines. What is your conclusion?
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
Suppose that you are the director of table game operations at a large casino, known especially for its poker room. You are interested in determining the average number of hands the casino should expect per hour during peak hours in the poker room.
Assuming that the first digit cannot be a zero, compute the number of possible outcomes when the digits can be repeated.
What is the probability you pick a plum and Which of the following is a legitimate probability distribution for this situation
a) Draw the scatter diagram. Does it appear that x and y are related? If so, how? b) Test to determine whether there is evidence of a linear relationship.
Construct a grouped frequency distribution using six classes.
Explain the difference between one-factor and two-factor ANOVA. (b) Write the linear model form of one-factor ANOVA. (c) State the hypotheses for a one-factor ANOVA in two different ways.
The study does provide sufficient evidence to support the claim that less than 75% of college student spend less than $250 per semester on textbooks.
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