Julius Ngwa

12:06

One Chapter Each Day that we meet

Julius Ngwa

12:30

Statistical Questions

Julius Ngwa

12:39

1 Hour 30 Minutes

Julius Ngwa

12:57

Recorded

Julius Ngwa

13:12

sla@franklin.edu

Julius Ngwa

13:22

Copy of the Recordings

Jeffery Hay

13:56

Yes

Julius Ngwa

14:21

Empirical Rule

Julius Ngwa

14:29

68% of Data

Julius Ngwa

14:36

95% of Data

Julius Ngwa

14:42

99.7% of the Data

Julius Ngwa

14:50

Calculator

Julius Ngwa

15:23

Statistics Test Scores

Julius Ngwa

16:08

75 and 85

Julius Ngwa

16:22

P(75 < X < 85) = 68%

Julius Ngwa

16:31

2nd VARS

Julius Ngwa

17:47

0.6826

Julius Ngwa

17:54

68.26%

Julius Ngwa

18:00

68%

Julius Ngwa

19:00

2nd VARS

Julius Ngwa

19:12

normalcdf(70, 90, 80, 5)

Julius Ngwa

19:44

0.9544

Julius Ngwa

19:49

95.44%

Julius Ngwa

19:53

95%

Julius Ngwa

20:29

Value on the Normal Distribution

Julius Ngwa

21:15

Mensa is an organization whose membership is limited to people whose IQ is in the top 2% of the population. Assume that scores on an IQ test are normally distributed with mean 𝜇 = 100 and standard deviation σ = 15. What is the minimum score needed to qualify for membership in Mensa?

Julius Ngwa

22:10

IQ Score to be in the Top 2%

Julius Ngwa

22:43

Given the Percentage and we are told to find the Actual Value

Julius Ngwa

22:50

Invnorm

Julius Ngwa

22:56

Syntax

Julius Ngwa

23:09

Area to the left of that Value

Julius Ngwa

23:47

2nd VARS

Julius Ngwa

24:42

130.81

Julius Ngwa

24:47

Top 2%

Julius Ngwa

28:00

A study reported that the length of pregnancy from conception to birth is approximately normally distributed with mean 𝜇 = 272 days and standard deviation σ = 9 days. What proportion of pregnancies last longer than 280 days?

Julius Ngwa

28:47

Question: What Proportion

Julius Ngwa

32:36

0.1870 = 18.70%

Julius Ngwa

36:53

Two Categorical Data

Julius Ngwa

37:07

Contingency Table

Julius Ngwa

38:58

Relationship between Gender and Smoking Status

Julius Ngwa

39:49

2 x 3 Table (2 x 3 Matrix)

Julius Ngwa

39:59

Chi-square

Julius Ngwa

40:08

Matrix on your Calculator

Julius Ngwa

40:13

20 30 50

Julius Ngwa

40:18

15 35 50

Julius Ngwa

40:48

2nd X-1

Julius Ngwa

40:56

Matrix

Julius Ngwa

41:11

EDIT

Julius Ngwa

41:23

2 X 3 Matrix

Julius Ngwa

42:02

STAT

Julius Ngwa

42:10

TESTS

Julius Ngwa

42:29

X-square Test (Chi-square Test)

Julius Ngwa

43:03

Two Values

Julius Ngwa

43:19

Chi-square Value = 1.099

Julius Ngwa

43:27

P-value = 0.5777

Julius Ngwa

43:43

P-value is below 0.05 (There is a Relationship)

Julius Ngwa

44:08

Gender and Smoking Status based on our Data

Julius Ngwa

45:03

Hours of Studying Per Week x Major

Julius Ngwa

45:23

There is any relationship between Hours of Study and Major

Julius Ngwa

45:48

3 Rows x 4 Columns

Julius Ngwa

45:52

3 x 4 Matrix

Julius Ngwa

46:02

68 106 131 40

Julius Ngwa

46:11

119 103 127 81

Julius Ngwa

46:18

70 52 51 52

Julius Ngwa

46:38

2nd X-1

Julius Ngwa

46:45

EDIT

Julius Ngwa

47:38

Observed {A]

Julius Ngwa

47:45

STAT

Julius Ngwa

47:51

TESTS

Julius Ngwa

48:27

Chi-square Value = 34.638

Julius Ngwa

48:45

p = 5.06E-6 = .00000506

Julius Ngwa

49:00

p-value is below 5% (0.05)

Julius Ngwa

49:17

There is a relationship between the hours of Study and Major

Julius Ngwa

49:23

Chi-square Tests

Julius Ngwa

49:30

Value and p-value

Julius Ngwa

49:36

Draw Inference

Julius Ngwa

50:08

Confidence Intervals

Julius Ngwa

51:18

Confident that The Governor's Ratings

Julius Ngwa

51:53

Estimate = 48%

Julius Ngwa

52:04

Confident (43%, 53%)

Julius Ngwa

52:27

How confident one is (Level of Confidence)

Julius Ngwa

54:10

Confidence interval for Proportion

Julius Ngwa

54:14

Three Values

Julius Ngwa

54:21

x =1300

Julius Ngwa

54:26

n = 2500

Julius Ngwa

54:34

Confidence Level = 95%

Julius Ngwa

54:58

STAT

Julius Ngwa

55:04

TESTS

Julius Ngwa

55:13

1 PROP Z INTERVAL

Julius Ngwa

55:28

A) Confidence interval for Proportion

Julius Ngwa

56:19

Estimate = 0.52 = 52%

Julius Ngwa

56:54

Confidence Interval (.5004, .5396)

Julius Ngwa

57:17

(50.04%, 53.96%)

Julius Ngwa

59:10

In a survey of 517 music teachers, 403 said that the video games Guitar Hero and Rock Band have a positive effect on music education. Construct a 95% confidence interval for the proportion of music teachers who believe that these video games have a positive effect.

Julius Ngwa

01:00:43

STAT

Julius Ngwa

01:00:46

TESTS

Julius Ngwa

01:01:00

A: 1 Prop Z Interval

Julius Ngwa

01:01:48

Estimate = 77.95%

Julius Ngwa

01:02:11

(74.38%, 81.52%)

Julius Ngwa

01:02:21

Estimate and Confidence Interval

Julius Ngwa

01:02:38

Confidence Interval for the Mean

Julius Ngwa

01:03:20

A machine that fills cereal boxes is supposed to put 20 ounces of cereal in each box. A simple random sample of 6 boxes is found to contain a sample mean of 20.25 ounces of cereal. It is known from past experience that the fill weights are normally distributed with a standard deviation of 0.2 ounce. Construct a 90% confidence interval for the mean fill weight.

Julius Ngwa

01:05:20

Not Proportion But Mean

Julius Ngwa

01:05:36

Z Interval

Julius Ngwa

01:05:38

STAT

Julius Ngwa

01:05:40

TESTS

Julius Ngwa

01:06:00

Z interval (For Mean and Population Standard Deviation)

Julius Ngwa

01:06:25

STAT

Julius Ngwa

01:06:27

TESTS

Julius Ngwa

01:06:37

7: Z Interval

Julius Ngwa

01:06:51

Stats is highlighted

Julius Ngwa

01:07:46

Estimate = 20.25

Julius Ngwa

01:08:04

Confidence Interval (20.12, 20.38) 90% Confdent

Julius Ngwa

01:08:32

Slightly higher than expected

Julius Ngwa

01:09:20

Scatter Diagram

Julius Ngwa

01:09:28

Two Continuous Variables

Julius Ngwa

01:10:35

Relationship between Size of the House and the Selling Price of the House

Julius Ngwa

01:10:49

Scatter Diagram

Julius Ngwa

01:11:31

As the Size of the House is increasing the Price of the House is also increasing

Julius Ngwa

01:11:41

Scatter Diagram

Julius Ngwa

01:12:01

STAT

Julius Ngwa

01:12:11

Press Enter (Edit)

Julius Ngwa

01:12:20

L1: Size

Julius Ngwa

01:12:25

L2: Price

Julius Ngwa

01:14:00

2nd Y =

Julius Ngwa

01:14:08

STAT PLOTS

Julius Ngwa

01:14:24

OFF

Julius Ngwa

01:15:25

Type Scattterplot

Julius Ngwa

01:15:50

ZOOM

Julius Ngwa

01:16:10

ZOOM STAT

Julius Ngwa

01:16:24

Scatterdiagram

Julius Ngwa

01:16:33

L1 - SIZE

Julius Ngwa

01:16:41

L2 - Selling Pice of the House

Julius Ngwa

01:18:13

Graphs

Julius Ngwa

01:18:18

STAT PLOT

Julius Ngwa

01:18:23

Box plot

Julius Ngwa

01:18:30

Size of the House

Julius Ngwa

01:19:08

Boxplot Just one list is requred

Julius Ngwa

01:19:46

2nd 2

Julius Ngwa

01:21:26

STAT

Julius Ngwa

01:21:33

TESTS

Julius Ngwa

01:22:31

What Test am I applying

Julius Ngwa

01:22:38

What Confidence Interval to Generate

Julius Ngwa

01:23:03

1 VAR STAT

Julius Ngwa

01:23:25

Linreg(ax +b ) Scatter Diagrams

Julius Ngwa

01:24:07

Setup the Editor L1 to L6

Julius Ngwa

01:24:16

STAT

Julius Ngwa

01:24:25

SetUpEditor

Julius Ngwa

01:24:35

All the Lists

Julius Ngwa

01:25:12

Done

Julius Ngwa

01:25:52

2nd VARS

Julius Ngwa

01:26:04

normalcdf

Julius Ngwa

01:26:08

Invnorm

Julius Ngwa

01:26:15

Normal Distribution

Julius Ngwa

01:26:34

binomialpdf

Julius Ngwa

01:26:39

binomialcdf

Julius Ngwa

01:26:41

2nd VARS

Julius Ngwa

01:26:51

2nd STAT

Julius Ngwa

01:27:01

MATH

Julius Ngwa

01:27:44

1 VAR STAT

Julius Ngwa

01:28:01

Catalog

Julius Ngwa

01:28:05

2nd 0

Julius Ngwa

01:28:16

ALL FUNCTIONS

Julius Ngwa

01:28:28

Mathematical Functions

Julius Ngwa

01:29:51

https://www.surveymonkey.com/r/Advanced_TI_83_84_Stats_Part_2_SP20