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A college student earned $5700 during summer vacation working as a waiter in a restaurant on the boardwalk at the beach. The student invested part of the money at 6% and the rest at 8%. If the student received a total of $382 in interest at the end of the year, how much was invested at 8%
construct a 95 confidence interval to estimate the population proportion with a sample proportion equal to 0.60 and a
two cards are drawn from a well-shuffled deck.a what is the probability that they form a blackjack i.e. one is an ace
Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones. What is the probability the first two electric toothbrushes sold will be defective.
the scores on a placement test given to college freshmen for the past five years are approximately normally
the owner of the house of greens greenhouse wants to estimate the mean height that her seedlings grow. a sample of 11
If 10 percent of the balls in a certain box art red and if 20 balls are selected from the box at random, with replacement
The value of σ is substantially affected by the duration of the lead time. In particular σ, increases as the lead time increases. The purpose of this problem is to enable you to explore this relationship further.
If x is the sample mean time for a random sample of n = 9 students, where is the x distribution centered, and how much does it spread out about the center (as described by its standard deviation)?
Find the probability that Marys total worth reaches $3000 at some point. (We assume here that Mary has to quit playing if she goes bankrupt so this is a gamblers ruin problem.)
The results of a two-factor analysis of variance, with interaction of factors, is given below. Completely interpret and explain these findings.
Find the critical value(s) and identify the rejection region(s). Find the standardized test statistic z. Decide whether to reject or fail to reject the null hypothesis.
How many departments would they need to survey to achieve this level of accuracy with 95% confidence?
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