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A survey found that the American family generates an average of 17.2 pounds of glass garbage each year. The standard deviation is 2.5 pounds. If researchers want to take a new sample of size 55, what will be the standard deviation of the distribution of the sample mean?
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant from the pheromone under study and a control substance.
Suppose a firm evaluates the productivity of the three shifts of workers who work in their factory. Each shift's performance is measured based on the amount of output that is produced during the shift - day, evening, or swing shift.
The Ohio Department of Highways is in the process of selecting a new paint for highway use. Four different paint companies have been contact regarding this need and each of the companies has supplied paint for testing.
Income level of the industrial salespeople and their employment status. Be sure to state the critical value, the value of the Chi-square test statistic, and your decision (accept/reject).
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49. Change the number from 49 to 16 and recalculate the confidence interval. Using results, explain the effect of an outlier or extreme ..
The mean life of a battery used in a digital clock is 305 days. The lives of the battery follow normal distribution. The battery was recently modified to last longer. A sample of 20 of the modified batteries had a mean life of 311 days with a stan..
The results of a recent study regarding smoking and three types of illness are shown below. The illnesses are Emphysema, Heart Problem, and Cancer.
A study conducted by the research department of a pharmaceutical company claims that the annual spending (per person) for prescription drugs for allergy relief,is greater than or equal to the annual spending (per person) for non-prescription aller..
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
Would this be a T-value distribution? Can you take me through the steps to determine upper and lower limits of a 95% confidence interval?
Is there enough evidence to believe that the average credit card debt has increased? Use a=0.05. Give a possible reason as to why or why not the debt was increased.
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