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The number of cars, X, that pass through a certain intersection on any weekday is approximately normally distributed with a mean of 852 and a standard deviation of 143. The proportion of days when at least 800 cars pass through the intersection is about?
The average salary for graduates entering the actuarial field is $40,000. If the salaries are normally distributed with a standard deviation of $5,000, find the probability that
In ANOVA, what does F=1 mean? What are the differences between a two sample t-test and ANOVA hypothesis testing?
Balls that have been thoroughly mixed. Sue and Jim, each, purchased one gumball. What is the likelihood both Sue and Jim get red gumballs?
The height of women at a school are basically distributed with mean 66.4 in. and standard deviation 3.7 in. Determine the range of heights centered about the mean in which:
If one runner is selected at random, what is the probability that this runner will complete this road race in less than 231.58 minutes?
How many seats sould be in the non-smoking area in order to be very sure (mean+3StandardDeviation) of having enough seating there?
What is the approximate probability that the total time spent on the calls will be greater than 98 minutes? Give your answer to four decimal places.
Conduct a one-tailed hypothesis test given the information below. A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours.
Find out 90% confidence interval for mean grade of all the students in the class.
Using the Hypothesis Tests Two Sample file and a .05 significance level, test whether there is a difference in the mean salary for men versus women.
Stanford Binet IQ scores have a mean of 100 and a standard deviation of 15. Albert Einstein reportedly had an IQ of 160. Convert Einstein's IQ score to a z score.
The Appliance Center sells a variety of electronics equipments and home appliances. For last four years the following quarterly sales (in $ millions) were recorded.
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