# Statistics Videos

Statistics Videos for elementary statistics:

I’m currently working on a slew of statistics videos for this site. Right now, you’ll find videos of the most popular topics plus a range of videos on Microsoft Excel (including Excel 2013) Subscribe to my Youtube Channel so you can receive updates about new videos.

# 4 thoughts on “Statistics Videos”

1. Sterling

Is there any way that you can make a video or two regarding chi-squared statistics in relation to making tables that include counts, percents, significance tests, and such?

I ask because I have a homework problem which has really stumped me. It would be good motivation for a video.
Stratum Sampled claims Number not allowed
Small 57 6
Medium 17 5
Large 5 1

a) Construct the 3×2 table of counts for these data that includes the marginal totals.
b) Find the percent of claims that were not allowed in each of the three strata.
c) To perform a significant test, combine the medium and large strata. Explain why we do this.
d) State an appropriate null hypothesis to be tested for these data.
e) Perform the significance test and report your test with degrees of freedom and the P-value. State your conclusion.

a) For example, in the “small” stratum, 51 claims were allowed, 6 were not allowed, and the total number of claims was 57. Altogether, there were 79 claims; 67 were allowed and 12 were not.
b) 10.5% (small claims), 29.4% (medium), and 20% (large) were not allowed.
c) In the 3×2 table, the expected count for large/not allowed is too small.
d) There is no relationship between claim size and whether a claim is allowed.
e) X^2 = 3.456, df = 1, P = 0.063.