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A recent national study about the effectiveness of Echinacea in cold treatments was performed by a medical school in Kansas City. The results stated that 22.5% of the randomly chosen 250 adult subjects in the placebo group in the study noted that their treatment appeared to shorten the length of their colds. The implied population in this study is a. All people taking Echinacea to treat their cold b. All the randomly chosen adult subjects in the study described c. All adults in United States d. All medical schools testing the effectiveness of Echinacea The implied sample in this study is a. All people taking Echinacea to treat their cold b. All the randomly chosen adult subjects of the placebo group in the study c. All adults in United States d. All medical schools testing the effectiveness of Echinacea The descriptive statistic of interest in this study is_____________. The study would be categorized as: (select ALL that apply) a. experimental b. cross sectional c. observational d. retrospective e. prospective Would the value of 22.5% described above be considered a parameter or a statistic? Why?
If we repeated this procedure many, many times, only 5 percent of the 95 percent confidence intervals would fail to include the mean Math SAT score of the population of all students at this college.
State the null and alternative hypotheses. Using the test statistic, degrees of freedom and p-value, what can you conclude about the null hypothesis? What is the 95% confidence interval of the difference? Interpret the 95% confidence interval using t..
a bank manager wanted to double-check her claim that recent process improvements have reduced customer wait times to an
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important? When might systematic sampling be biased?
Determine whether descriptive or inferential statistics have been used in the statement below:
suppose that the life span of a certain type of fan has an exponential distribution with a mean life span of 25000
Balls that have been thoroughly mixed. Sue and Jim, each, purchased one gumball. What is the likelihood both Sue and Jim get red gumballs?
At the 0.05 significance level, can he conclude that number of absences has declined? calculate approximately the p -value.
Find the mean and standard deviation for the number of left-handed students in such classes of 25 students.
The second plane's speed is also normally distributed with mean and standard deviation 500and 10,respectively. What is the probability that plane 2 did not catch up to plane one after two hours of flight?
As you know, the percentile for a value is a measure of where that value stands with respect to the rest of the data. As a criterion for college admissions, why would many schools use a percentile value for a standardized test, rather than a raw s..
a researcher reports that when groups of four children are randomly selected from a population of couples meeting
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