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The age distribution of householders is an important tool for marketer interested in providing age-appropriate advertising for the particular product they wish to market. A study conducted by the Joint Center for Housing Studies estimates that, in 1995, 31% of all householders will be between 45 and 64. Suppose a sample of 500 is taken in 1995. (Hint: use the normal approximation to the binomial.)
What is the probability that fewer than 135 householders will be between 45 and 64?
What is the probability that between 135 and 180 householders inclusive will be between 45 and 64?
suppose that the times people spend being served at a post office window are approximately normal with mean 1.5
Suppose a wedding photographer claims he can finish a bride's wedding photos in less than 7 days. You are given the following data from a sample. Formulate a hypothesis test to evaluate the claim.
A study determined that 5% of persons age 65 to 4 have a certain symptom. A group of 17 persons age 65 to 74 are selected at random. Find the probability that at most 1 person has the symptom.
For a sample of 120 students selected at random, what is the mean and variance of the number of students who watched this event?
At a 5% level of significance, is there enough evidence from this survey to conclude that more than half of all adults would rather have $100 than a day off?
State the null and alternative hypotheses using proper Statistical Notation
using the standard normal table find the proportions for the areas listed belowa. the area between z 0 and z 2.13b.
a null hypothesis is that the mean nose lengths of men and women are the same. the alternative hypothesis is that men
Find the probability that 665 or fewer college students in the sample send and receive text messages with their phones? Is this result unusual?
how many 10 digit hexadecimal numbers begin and end with f? how many 8-digit octal numbers begin and end with an even
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
An experiment was conducted to determine the effects of three different pesticides (P1,P2,P3) on the yield of three different varieties of citrus tree (V1,V2,V3).
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