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1. Suppose 2 batteries are randomly chosen from a bin containing 10 batteries, of which 7 are good and 3 are defective. Let x denote the number of defective batteries chosen.
a. List all of the possible values of x
b. Set up the probability distribution
c. Find the mean, and the standard deviation
2. The distribution for the time it takes a student to complete the fall class registration has a mean of 94 minutes and a standard deviation of 10 minutes. For a random sample of 80 students, determine the mean and standard deviation of the sample mean. What can you say about the sampling distribution of the sample mean and why?
Can you conclude that the information in the article is untrue? Use the 0.05 significance level. Determine the p-value and explain its meaning.
30% student take only Chinese, 30 % student take only Maths. It is found that both male n female has the equal chance to wear spectacles. Draw a tree diagram.
1.a scientist examined the effect of temperature and catalyst on the yield of a reaction. he ran the experiment at both
You construct a 90% confidence interval for the average stock price to be (267.348, 279.472). Of the following choices, what is the approporiate interpretation of this interval?
assume that a practitioner decides to use a control chart wtih a 2.5-sigma limits. if normality can be assumed as
question the average annual total return for u.s. diversified equity mutual funds from 1999 to 2003 was 4.1
the time to failure of a certain type of electrical component is assumed to follow an exponential distribution with a
A sample of 100 orders revealed that 82 were delivered within the promised time. At the .10 significance level, can we conclude that less than 90 percent of the orders are delivered in less than 10 minutes?
After a bumper crop, a mushroom grower hypothesizes that mushrooms will remain at the average wholesale price of $1 per pound. State the null hypothesis and the alternative hypothesis.
(a) a white chip on the first draw?
What is the point estimate of the mean planned expenditure by all Americans taking long summer vacations in 2002?
The ANOVA table is given below,as well as a table of means and standard deviations for the three groups. Evaluate the t statistic for testing contrast
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