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It is estimated 30 % of all adults in United States invest in stocks and that 88% of U.S. adults have investments in fixed income instruments (savings accounts, bonds, etc.). It is also estimated that 25% of U.S. adults have investments in both stocks and fixed income instruments
(a) What is the probability that a randomly chosen stock investor also invests in fixed income instruments? Round your answer to 2 decimal places.
(b) What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments? Round your answer to 2 decimal places.
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
What is the probability that chloride concentration diers from the meanby more than 1 standard deviation? Does this probability depend on thevalues of mean and standard deviation
a point is chosen at random from the region s in the xy-plane containing all points xy such that -4 lt x lt 4 -1 lt y
Construct a 95% confidence interval for the proportion of people disagreeing with the statement.
In the previous exercise, the table has some small counts, and exact methods have greater validity than large-sample ones. Conduct an exact test of independence using the scores in (a).
the two largest cable providers are concast cable connections with 21.5 million subscribers and time warner cable with
in a normal distribution find the probability expressed as a percentage that is greater than a z score of
question in a discrete mathematics class every student is a major in computer science or mathematics or both. the
From this data set, obtain the corresponding values for Y de?ned as the product Y = X1 X2 . According to the result stated and proved in (i), what is the theoretical distribution of Y? Con?rm that the computed sample data set for Y agrees with this p..
discuss the advantages of constructing a relative frequency distribution as opposed to a frequency
Which of the following statements is consistent with the scatterplot
At the end of a year the change in participants' blood pressure over the year was measured, and the change was compared for the two groups.
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