Chapter 13: Inferential Statistics and Distributions
332
Interpret the results.
The first line, (
159.74,173.94
), shows that the 99 percent confidence interval for the
population mean is between about 159.74 centimeters and 173.94 centimeters. This is
about a 14.2 centimeters spread.
The .99 confidence level indicates that in a very large number of samples, we expect 99
percent of the intervals calculated to contain the population mean. The actual mean of
the population sampled is 165.1 centimeters, which is in the calculated interval.
The second line gives the mean height of the sample
v
used to compute this interval.
The third line gives the sample standard deviation
Sx
. The bottom line gives the sample
size
n
.
To obtain a more precise bound on the population mean
m
of women’s heights, increase
the sample size to 90. Use a sample mean
v
of 163.8 and sample standard deviation
Sx
6.
Press
†
to move the cursor onto
Calculate
, and
then press
Í
. The confidence interval is
calculated, and the
TInterval
results are displayed
on the home screen.
Summary of Contents for -84 Plus
Page 1: ...TI 84 Plus TI 84 Plus Silver Edition Guidebook...
Page 213: ...Chapter 8 Draw Instructions 210...
Page 248: ...Chapter 10 Matrices 245 row value matrix rowA rowB...
Page 332: ...Chapter 12 Statistics 329...
Page 413: ...Chapter 14 Applications 410...
Page 427: ...Chapter 15 CATALOG Strings Hyperbolic Functions 424 sinh 1 value cosh 1 value sinh 1 value...
Page 496: ...Chapter 17 Activities 493 If C A and D B Stop Goto Z Quit if guesses are correct...
Page 672: ...Appendix C Service and Warranty Information 669...