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A student kept track of the number of hours she studied each day for a 2-week period. The following daily scores were recorded (scores are in hours): 2.5, 3.2, 3.8, 1.3, 1.4, 0, 0, 2.6, 5.2, 4.8, 0, 4.6, 2.8, 3.3.
Calculate
a. The mean number of hours studied per day
b. The median number of hours studied per day
c. The modal number of hours studied per day education.
With reference to Exercise 32, construct a 90% confidence interval for the standard deviation of the population sampled, that is, for the percentage of impurities in the given brand of peanut butter.
A sample of 25 students enrolled in the university indicates that X (bar) = $315.4 and s = $43.20.
Test the hypothesis that there is no difference between the means of retailers (α= .05). Select a multiple comparison test, if necessary, to determine which groups differ in mean sales (α= .05).
If one person is selected at random, what is the probability that person is Female?
Herbicide and corn hybrids. Genetic engineering has produced new corn hybrids that resist the effects of herbicides. This allows more effective control of weeds, because herbicides don't damage the corn.
Find a dataset: approximately 30-100 scores or observations. Write a null and alternative hypothesis, conduct a statistical significance test (in SPSS or Excel), and tell what decision you'd make about the null hypothesis, and why.
Show all work. What is the probability that a randomly selected US resident did not live in Idaho? The total 2008 US population was 303,824,640.
when playing a new board game you are required to roll 6 standard six-sided dice. if x is the number of 6s rolled the
explain the difference between sampling with and without replacement. what does sampling without replacement mean about
If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95% confidence interval estimate for the true mean.
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
the population of iq scores forms a normal distribution with a mean of micro 100 and a standard deviation of o
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