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The margin of error for polling results is typically determined as the half-width of a 95% confidence interval. With respect to a particular ballot proposition, a random sample of 423 voters indicated 51% support and 49% oppose the measure. What is the margin of error? Interpret the result.
Does a regression model imply causation? Why or why not? Provide an example which provides and independent and dependent variable from your place of work.
The director of a radio broadcasting company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
We monitor the number of incoming calls into a doctor's office. Let X be the number of incoming calls between the hours of l pm and 2 pm and Y be the number of calls between l pm and 3 pm.
Comparison of paired and unpaired samples test - Prepare a brief conclusion statement summarizing your results. What can you tell this MHMR about client satisfaction? What could you suggest they do to improve?
Discuss how graphical representations can be used to display data in a meaningful way. Choose a specific business application and describe an example of a specific graph or chart that can be used to interpret data and why it is so useful.
Assume that each shipment contains a random sample of bearings. a. What is the probability that a given shipment is acceptable?
The average price of a car wash is $5.00. A sample of six car washes averaged $5.70 and had a sample standard deviation of $1.30. Assuming a normal population, use the critical value method to test the claim at a= 0.05.
A IRS auditor randomly selects 3 tax returns from 48 returns of which 9 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places.
The researcher also gathers data on age and major to see if there is any connection between these varibales and frequency of sexual harassment.
Is the bottled water you're drinking really purified water? A four year study of bottled water brands conducted by the natural resources found that 25% if bottled water is just tap water. Consider a sample of five bottled water brands, and let x e..
Approximately 14 percent of the population of Arizona is 65 years or older. A random sample of five persons from this population is taken. The probability that less than 2 of the 5 are 65 years or older is:
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