## Statistics Questions and Answers

Statistics

### Would statistics on the political affiliation of members of a local church be an example of nominal, ordinal,...

The most likely answer is that this data would be nominal. Depending on how the political scientist was gathering the data, it could conceivably be ordinal or even interval. But this is much less...

Statistics

### Which of the following is NOT true about forecasting? It is good practice to include a measure of expected forecast...

Let's consider each statement in turn. "It is good practice to include a measure of expected forecast error with any forecast."That one is clearly true. You always want to include error measures in...

Statistics

### Why is an expanded concept of variation necessary in statistical improvement? Is all variation necessarily numerical?...

I think you could argue an expanded concept of variation is necessary in statistical improvement because it makes the study of statistics less mechanical. That is to say, students should be able to...

Statistics

### When forecasting using moving average, if you use a shorter number of periods to calculating the moving average, it...

The reason we use moving averages in the first place is that a lot of time-series data is noisy; due to errors in data collection or random fluctuations in the real-world phenomenon, the data jumps...

Statistics

### What are the most important aspects of validity for the tester? give anser in points

Validity refers to the point up to which the test that is being taken is actually testing and measuring what is supposed to. There is no specific definition other than this, considering that the...

Statistics

### Can you please begin to explain to me the difference between how concepts are measured and a variable in social...

A concept is simply an idea. It is something that is fairly vague and it can be difficult to understand how to measure the concept. A variable is much more specific and concrete. It is a...

Statistics

### Can you tell me which of the following is an example of a true negative outcome? 1. Mary's pregnancy test came back...

In all of these cases, we are doing some sort of test. We are asking a yes or no question and trying to answer it with our test. In Option 1, we ask if Mary is pregnant. In Option 2, we ask if...

Statistics

### When using statistical evidence, why is it important that it was compiled by a disinterested source?

The reason for this is that statistics can easily be manipulated to tell a story that a particular source wants them to tell. Therefore, you need to have evidence from a source that is not trying...

Statistics

### How can it be explained that causal statements cannot be made from correlational data? This is about correlation in...

Correlational data cannot tell us that causation has occurred. We should also note, though, that correlation does not mean that causation has notoccurred. All that correlation can tell us is that...

Statistics

### A researcher has collected two samples of data, and the sample variances are 2.16² and 4.82². It would be appropriate...

The purpose of a two-sample t-test is to determine if the difference between the two sample populations is statistically significant—essentially asking if the two samples were taken from the same...

Statistics

### How do you deal with response rate, missing data, and the errors they create?

This question lacks specifics. So, my answer will have to be somewhat broad. Whenever there is a problem of response rate or missing data, there can be many problems, as you can imagine. Therefore,...

Statistics

### A politician is concerned with winning an upcoming election. What null hypothesis is he testing if he commits a Type...

A person makes a Type I error when they rejected a null hypothesis that could possibly be true. In this case, the politician is saying that he will certainly win the election. Of course, he is...

Statistics

### A U.S. travel center survey reported that Americans stayed an average of 7.5 nights when they went on vacation. The...

A U.S. travel center survey report states that Americans stayed an average of 7.5 nights when they went on vacation. The sample size is 1500. The point estimate of the population mean is the...

Statistics

### Find the mean from the following chart: class frequency 31-33 18 34-36 ...

The question has been edited as you can ask only one question at a time. To determine the mean from the given frequency table first determine the mid point of each interval. interval...

Statistics

### Why is the analysis of statistic sometimes considered an art?

The analysis of statistics may possibly be considered art--"the expression or application of human creative skill and imagination"--since it can sometimes involve a creative manipulation of...

Statistics

### When is a type 1 error made?

When you are talking about type 1 errors you are looking at a statistical term that means that after running a statistical analysis you have rejected a null hypothesis (the hypothesis that states...