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Assume the null hypothesis is that μ = 50 and that the graph shown below is the sampling distribution of the mean (M). Would a sample value of M= 60 be significant in a two-tailed test at the .05 level? Roughly what value of M would be needed to be significant?
a computer program can make calls to two subroutines a and b. in a randomly chosen run let x be the number of calls to
Out of a total of 10 college textbooks estimate the standard devialtion of their ages if the oldest textbook is known to be 7.9 years old and the newest textbook is 1.3 years old.
Test the whether the attitude toward keeping weight down associated with smoking status.
a. Construct a bar chart that effectively displays these data. b. Construct a pie chart to display these data.
A random sample of 700 drivers has been taken. What is the probability that between 538 and 546 of the drivers were wearing their seat belts?
Construct a 95% confidence interval for the true difference in population proportions of high LDL (p1-p2) between female and male populations.
1. an insecticide company exposes 10000 cockroaches to its newest product and exposes another 10000 to their previous
In a sample of 20 men, the mean height was 178 cm. In a sample of 30 women, the mean height was 164 cm. What was the mean height for both groups put together?
Is the distance beyond or before the double lines where a car stops at an intersection affected by the age of the driver (young, middle age, older) and/or whether or not there are any passengers?
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
the nuchal translucency test is a special ultrasound scan which is widely used as a screeding test for downs syndrome
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
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