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A producer of various kinds off batteries has been producing "D" size batteries with a life expectancy of 87 hours. Due to an improved production process, management believes that there has been an increase in battery life expectancy. A sample of 36 batteries showed an average life of 88.5 hours. If the standard deviation of the population is 9 hours, determine whether there has been a significant increase in battery life expectancy.
The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.
Which variable would you use as the explanatory variable and which as the response variable? Why? What would you expect to see in the scatterplot? Discuss the likely direction, form, and strength.
Create network for aerospace launch project below and determine its critical path.
A recent study of cardiovascular risk factors reports that 30% of adults meet the criteria of hypertension. if 15 adults are assessed, what is the probabiliy that?
Determine the mean and the standard deviation of the sample.
Run a regression of Y on X in Excel and turn in the output with a note explaining what the coefficients {correlation coefficient (multiple R), standard error, t-statistic and F-statistic} mean.
If Larry gets a 70 on a physics test where the mean is 65 and the standard deviation is 5.8, where does he stand in relation to his classmates?
The regional tupperware dealers earned these commissions last month: what was the mean commision earned? round your answers to the nearest cents.
Using a separate 2 by 2 table, compute predictive value positive and predictive value negative for population of 1,000 drug users.
A random sample is selected from a normal population. The population mean is 60 and the standard deviation is 15. after treatment the sample mean is 65. the sample size is 25.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Suppose a social worker is involved in a study about family structure. She obtains information regarding the number of children per family in a certain community from the census data. What is the random variable of interest? Is the random variable..
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