Number of observation required
90% confidence interval with a margin of error of 2 minutes. a normal distribution with a standard deviation of 30 minutes. the number of observation required is ?
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Suppose that the lifetime of a light bulb is exponentially distributed, with a mean of 2,000 hours. What is the probability that the light bulb will burn out in fewer than 1,000 hours?
46% of men consider themselves professional baseball fans. you randomly select 10 men and ask if he considers himself a professional baseball fan. Find the probability that the number who consider themselves baseball fans is (a) exactly eight, (b)
The variable years of education was measured as last year in school completed (i.e., none, 1st, 2nd, 3rd, grades, etc.). It is, therefore, measured at the __________ level.a
Because low marital satisfaction should lead to divorce, Professor Rogers checked his measure of marital satisfaction by examining whether couples with low marital satisfaction scores later obtained divorces and those with high levels of marital s
Use a statistical software system to determine whether there is a difference in the mean weights of candies of different colors. Use the .05 significance level.
A social scientist claims that the average adult watches less than 30 hours of television per week. He collects data on 50 individuals' television viewing habits and finds that the mean number of hours that the 50 people spent watching television
Which one of the following teachers is definitely keeping in mind Piaget s idea that assimilation and accommodation are both necessary for learning and cognitive development to occur?
the combined sat scores of students are normally distributed with a mean of 950 and a standard deviation of 200. nancy bright's sat score was 1390. what percentage of students have scores more than nancy bright?
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