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Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16.
a. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
b. In what interval would you expect the central 95% of IQ scores be found
c. About what percent of people should have IQ scores above 116?
d. About what percent of people should have IQ scores between 68 and 84?
e. About what percent of people should have IQ scores abouve 132?
Determine the critical path probability that project will be completed within?
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
Assume the arrival of these emails is approximated by the Poisson distribution.
According to the study, the mean age of a self-employed individual is 46.6 years with a standard deviation of 10.8 years.
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
Estimating the sample standard deviation using normal score - Find the sample standard deviation?
A random sample of 100 oranges is gathered and the mean diameter obtained was 5.12. If another sample of 100 is taken, what is the possibility that its sample mean will be greater than 5.12 inches.
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.
The study does not give sufficient evidence to support the claim that less than 75% of college students spend less than $250 per semester on textbooks.
(a) Consider a normal distribution with mean μ = 88. If 2% of the values lie below x = 50, find the standard deviation σ. (b) Consider a normal distribution with standard deviation σ = 15.6. If 10% of the values lie above x = 17.2, find the mean μ.
How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test
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