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A sample of the homes currently offered for sale revealed that the mean asking price is $75,900, the median $70,100 and the modal price is $67,200. The standard deviation of the distribution is $5,900. What is the Pearson's coefficient of skewness? __________.
A large population of overdue bills has balances that fallow a normal curve. When we take a sample of 100 of these the average is $500 and the standard deviation is $100.
Does this sample give sufficient evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of general population? Use two-tailed test with α = .01.
Assume that waiting times are approximately normally distributed. Construct a 98% confidence interval for the population mean of waiting times.
What is the null hypothesis in a chi-squared test of independence? List the assumptions under which the linear regression model is supposed to work.
A sample of the personal files of eight male employees revealed that during a six month period they lost the following number of days due to illness 2, 0, 6, 3, 10, 4, 1, 2. Calculate the standard deviation. show your work.
An election poll reported that a candidate had an approval rating of 34% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
For machine gun ammunition to be acceptable, the US Army requires that 96 percent of rounds fired hit a specified target. The test is to fire a 50 round burst at the target and observe whether this condition is met.
The random digit dialing machine is expected to reach a live person 15% of the time. In eight attempts, what is the probability of achieving exactly two successful calls?
Does the data prove a significant difference in mean times?
What is the 25th percentile of a X² distribution with 20 degrees of freedom? What symbol is used to denote this value?
Suppose that the average number of years to graduate at a university is 4 years, with a standard deviation of 0.5 years. From the Empirical Rule, what is a range of values that 95% of the students should graduate between?
The mean of this sample belongs to a sampling distribution.
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