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1. Why is sampling strategy important? Please provide one or two examples from your work or past experience?
2. What is the difference between the population of the study and the sampling frame? Provide an example to support your response.
3. Non probability (purposive, quota) and probability (simply random, cluster) are two very different types of sampling designs. What are the pros/cons of each design? When and why would you choose one from the other? Provide an example to support your response.
4. Why is it important to create a hypothesis before conducting research?
5. What are the differences between directional and non-directional hypothesis? Provide an example of each case.
6. What is the difference between a null hypothesis and an alternative hypothesis? Provide an example to support your response.
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course:
Using your workplace, present or prior, or an organization with which you are affiliated, identify a quantitative and a qualitative variable of interest to you.
The 2006 General Social Survey asked, "what do you think is the ideal number of children for a family to have?" The 1097 females who responded had a median of 2, mean of 3.16, and a standard deviation of 1.91.
If a null hypothesis is rejected at a significance level of .01, it will ______ be rejected at a significance level of .05
Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
Suppose that 1% of all the students seeking treatment at the school infirmary have mono. Of the students who do have mono, 90% complain of a sore throat. Of the students who do not have mono, 30% also have sore throats.
A beverage company is trying to ?nd out the distribution of the breaking strength of their glass bottles. Fifty bottles are selected at random and tested for breaking strength, with the following results (in pounds per square inch):
Hypothesis test for one population mean - What is the alternative hypothesis and What is the null hypothesis?
Among 620 adults selected randomly from among the residents of one town, 18.9% said that they favor stronger gun-control laws.
If a total of 5,450 packages are shipped for .$1,926, determine how many individual packages were shipped and how many groups of 15 were shipped.
Explain thoroughly, the concept of standard deviation. How does range affect standard deviation? What is a z-score, and how do z-scores relate to the mean of a set of data?
Do the data indicate that the sleeping pill is effective at a 1% level of significance?
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