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Revisiting the comparison of LDL levels for males and females
In Exercise 7.62 (page 467), the LDL levels for males and females were compared using the two-sample t procedures that do not assume equal standard deviations. Compare the means using a signi?cance test and ?nd the 95% con?dence interval for the difference using the pooled methods. How do the results compare with those you obtained in Exercise 7.62?
a box contains 11 red balls 5 green balls and 4 black balls. a sample of 8 is to be picked from the box. in how many
Suppose that, in a sample of 200, we observe 140 successes. Is this sufficient evidence at the 1% significance level to indicate the the population proportion of successes is greater than 65%
enzyme immunoassay tests are used to screen blood specimens for the presence of antibodies to hiv the virus that causes
using a normal curve table give the percentages of scores between the mean and a z-score ofa 0.56b 0.57c 1.46d 1.56e
a company wished to study the effectiveness of a coffee break on productivity of its workers. the productiveness of
Examples of the binomial and poisson distributions are all around us. Identify a real-life example or application of either the binomial or poisson distribution. Specify how the conditions for that distribution are met.
the female students in an undergraduate engineering core course at asu self-reported their heights to the nearest inch.
The yield, in bushels per acre, of a certain type of feed grain in the midwest can be represented as the out come of the random variable Y defined by
heights of women have a bell-shaped distribution with a mean of 156 cm and a standard deviation of 8cm using the
Calculate the paired sample t statistic for these mood scores and How has the relation between the mean and the median changed? What does this suggest about the distribution of the transformed data?
What is the mean of the sampling distribution of the (sample proportion) and what is the standard deviation of the and describe the sampling distribution of p
What information is provided by the sign (= or -) of the Pearson correlation? What information is provided by numerical value of the Pearson correlation?
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