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A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were:
3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477
a. Construct a 90 percent confidence interval for the true mean weight.
b. What sample size would be necessary to estimate the true weight with an error of + 0.03 grams with 90 percent confidence?
c. Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.
a) 95% of confidence intervals generated will include the sample mean X. b) 5% of the confidence intervals generated will include the true mean μ
A delivery truck averages 15 miles per gallon, with a standard deviation of 3 miles per gallon, and that fuel consumption is Normally Distributed.
the null hypothesis is to be tested at 95% confidence. Determine the critical value(s) for this test.
In this study we will consider the current issues of operational expenses in relation to the number of staff and number of branches being experienced by 123 Finance Inc.
Test whether the mean weight is greater than 16 ounces with P-value approach.
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
We wish to know if, on the basis of these data, we may conclude that the mean systolic blood pressure for a population of African-American men is greater than 140.
A random variable X that has pmf given by p(x) = 1/ (n+1) over the range Rx = {0,1,2,...,n} is said to have a discrete uniform distribution. Find the mean and variance of this distribution.
Kolzak Appliance has just received a shipment of 10 TV sets. Shortly after they were received, the manufacturer called to report that he had inadvertently shipped 3 defective sets.
The U.S.Census Bureau announced that the median sales price of new homes sold i April 2009 was $221,660, and the mean sales price waas $274,300. Assume that the standard deviation of the prices is $90,000.
Which measure of association would the researcher use to compare the relationship between the IV and DV? Why?
what is the sample space of all possible outcomes? Are the outcomes equally likely?
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