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The union for a particular industry has determined that the standard deviation of the daily wages of its workers is $20.. A random sample of 100 workers in this industry has a mean daily wage of $116. Find a 95% confidence interval for the true mean daily wage of all union workers in the industry. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
What is the lower limit of the 95% confidence interval?
What is the upper limit of the 95% confidence interval?
An auditor for a large oil corporation has taken a random sample of monthly credit card charges for 32 individual (non-corporate) accounts.
Construct a 90% confidence interval to estimate the difference of (average number of gallons sold on weekdays - average number of gallons sold on weekends). Assume the population standard deviations are the same for both weekdays and weekends.
The Financial Advisor exam has a mean of 500 and a standard deviation of 20. If the bank chooses to hire either Steve or Mark based solely on their exam performance, who is the bank more likely to hire? Show evidence for your answer.
The F-test cannot be used to answer whether or not there is a significant difference between the means.
An experiment was conducted to determine the effects of three different pesticides (P1,P2,P3) on the yield of three different varieties of citrus tree (V1,V2,V3).
Using a normal distribution with a mean of 1118 and a standard deviation of 52 for the weights of steers, what percent of steers weigh over 1250 pounds, under 1100 pounds, between 1000 and 1150 pounds.
Assume that respondents had been asked for party affiliation in a poll. THe responses were coded as 0 (for democra), 1 (for republican), 2 (for independent), or 3 (for any other response).
Start rolling dice until a particular number, say 3, is obtained, and keep track of how many rolls are necessary. Repeat 100 times. Then find the average.
Researcher is interested in testing whether there are differences in mean between population one and population two.
Twelve doctor's offices were given 3 lab inspections with the following results:
When we carry out a chi-square test of independence, the expected frequencies are based upon the Null hypothesis - true or false.
If the loss of weight of customers at the end of their first month is normally distributed with a mean of 6.7lbs and a standard deviation of 0.81lbs
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