Statistics Questions and Answers

Statistics

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...

Latest answer posted October 2, 2012, 7:06 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted April 25, 2016, 9:51 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted November 1, 2020, 1:44 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted April 25, 2016, 9:09 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted November 5, 2012, 6:39 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted February 26, 2012, 10:52 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted August 23, 2013, 1:30 am (UTC)

1 educator answer

Statistics

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...

Latest answer posted March 31, 2012, 2:39 am (UTC)

1 educator answer

Statistics

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...

Latest answer posted April 12, 2012, 2:18 am (UTC)

1 educator answer

Statistics

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...

Latest answer posted June 14, 2019, 7:41 pm (UTC)

1 educator answer

Statistics

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,...

Latest answer posted January 19, 2012, 11:26 am (UTC)

1 educator answer

Statistics

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...

Latest answer posted November 4, 2012, 3:55 am (UTC)

1 educator answer

Statistics

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...

Latest answer posted October 19, 2013, 1:13 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted November 9, 2012, 3:36 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted June 30, 2014, 6:16 pm (UTC)

1 educator answer

Statistics

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...

Latest answer posted March 28, 2013, 1:11 am (UTC)

1 educator answer