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The Rockwell Hardness Index for Steel is determined by pressing a diamond point into the steel and measuring the depth of penetration. For 50 specimens of a steel alloy, the Rockwell hardness index averaged 62 with a standard deviation of 8. The manufacturer says this alloy has an average hardness index of at least 64. Is there enough evidence to refute what the manufacturer has said? with a significance level of 1%?
The test statistic is:
The critical value is given by:
The decision is:
The decision will be worded as follows: We do not reject Ho or We reject Ho
Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently
At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
Create a dummy variable based on the variable gender. The dummy should equal 1 for male children and 0 otherwise. Name this variable gender dum.
Discuss, in relative terms, the sample size needed for an application of a normal distribution for the sample mean when sampling is from each of the following.
a standard 6-faced die is rolled twice in an experiment. let a and b be the outcome of the 1st and 2nd rolls
Random sample of 250 americans is selected, the mean of this sample belongs to a sampling distribution. What is the shape of this sampling distribution?
Pygmalion was a mythical king of Cyprus who sculpted a figure of the ideal woman and then fell in love with his own creation.
what do you conclude if 50000 people respond to an nbc news survey in which tv viewers were asked to a call a toll-free
Given the executives' subjective probabilities for the three possible states of industry growth, what will be the company's expected profit if it chooses not to renovate the plant?
"The results below are based on telephone interviews with a randomly selected national sample of 1021 adults, 18 years and older, conducted July 22-25, 1999. - What is the margin of error for this survey? Give two separate ways in which you know th..
What rate of return does your loan receive?
Based on these findings, what is the relative risk of developing obesity in those who eat at least five fast food meals per week?
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