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Describe the following types of sample designs, noting their similarities and differences. State also when it is appropriate to use each type of sample de- sign.
a. Random sampleb. Simple random samplesc. Convenience/grab bag samplesd. Systematic samplese. Stratifiedf. Clusterg. Bootstrap
You don't have a population standard deviation but you have sample data. Calculate a sample mean and standard deviation and use the sample standard deviation value to complete the inferential test.
At a certain college, there were 700 science majors, 100 engineering majors, and 500 business majors. If one student was selected at random, the probability that they are an engineering major is?
question 1 what is the difference between the chi-square test for goodness-of-fit and the chi-square test for
a research organization wanted to estimate the average number of hours a college student sleeps per night during the
the estimated cost for a national poll is 10 per person interviewed. a project has a budget of 15000 for the poll. the
Using classical methods discussed in class, try to estimate the probability of winning.
When making the histogram from frequency table, (a) what goes along the bottom, (b) what goes along the left edge, and (c) what goes above each value?
Last school year, student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classificati..
A pharmaceuticals company claims to have developed a cure for the common cold. In order to test whether this is true, one group of recent cold-sufferers was given this medicine and another group was given a placebo instead.
information from the department of motor vehicles indicates that the average age of licensed drivers is micro 45.7
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation
Will an SRS of size 1785 usually give a result p-hat within plus or minus 3 percentage points of the true population proportion? Explain.
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