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Descriptive Statistics
When summarizing interval-ratio variable data using descriptive statistics, what do we lose in our understanding of a sample if we just report the mean and not any measures of dispersion such as the interquartile range or standard deviation? How might this apply to our understanding of a variable such as crime rates in major cities or incarceration rates for minorities across counties?
a researcher wants to construct a 98 confidence interval for the proportion of elementary school students in seward
The weekly salaries of teachers in one state are normally distributed with mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than $525 per week?
Identify the class width - identify the midpoint of the first class and identify the class boundaries of the first class.
At a recent meeting of educational researchers comparison were made between the type of college freshmen attend and the numbers who drop out. Use a significance level of .05 and determine if the type of school and the drop out rate are independent.
if the level of confidence is increased while the sample size remains the same how will the width of a confidence
1. Explain in your own words the role that data can play in the development of models of uncertainty in decision analysis.
If one person is picked at random from all the people represented in the table, what is the probability of the following events?
Construct the confidence interval to find the estimated margin of error. Then find the sample mean and you are given the sample mean and sample standard deviation. Use this information to construct the 90% and 95% confidence interval for the popula..
a psychologist studied the effect of frequent testing on perception of course material. in one of the professors
Assess the impact of an event on a population. I ran a survey before the event and then I ran the survey after the event. The collected responses matched between prior to the event and after. I used paired t-test to determine if the event had a posit..
Construct an appropriate control chart and comment on the process.
Find the minimum sample size needed, using a prior study that found that 36% of the respondents said they have high speed Internet access.
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