Unit B-3: Practice Now

Practice Materials for 'Warnings'

1. This table contains US Employment data by race for 1995.

Workforce (1000)	White	Black	Total
Employed	107120	13279	120339
Unemployed	5459	1539	6998
Total	112579.	14818	127397

a. What is the P(Unemployed)?
b. What is P(Unemployed given White)?
c. What is P(Unemployed given Black)

Possible answer

2.This table contains U.S. Employment data by age for 1995.

Workforce (1000)	under 25	25 or over	Total
Employed	18022	102377	120339
Unemployed	2519	4479	6998
Total	120399	6998	127397

a. What is the P(Unemployed)?
b. What is P(Unemployd given under 25)?
c. What is P(Unemployed given 25 or over)

Possible answer

3. This table contains Employment Data for 1995 by race and age.

Race vs. Age (1000)	White		Black		Total
Workforce	Empl	Unemp	Empl	Unemp	Empl	Unemp
under age 25	15993	1883	2029	636	18022	2519
25 or older	91127	3576	11250	903	102377	4479
Total	94703	17876	13279	1539.	120399	6998..

a. Find the unemployment rate for white workers under 25.
b. Find the unemployment rate for black workers under 25.
c. Find the unemployment rate for white workers 25 and over.
d. Find the unemployment rate for black workers 25 and over.
e. Which variable has the greatest influence, age or race?

Possible answer

4. The percent of adults aged 20 to 74 who are obese based on their body mass index increased from 24% in the 1960s to 33% in 1988-91. By 1994, the share of all adults aged 20 and older who are overweight climbed further, to 35%.

If telemarketers for a diet company randomally call 5 adults, what is the chance they will reach at least one obese adult? Describe this event.

Possible answer

5. Cystic fibrosis is a disease caused by a recessive gene. The disease becomes apparent in childhood and until recently most having the disease died in early childhood. Without genetic testing, carriers are unaware they have the cystic fibrosis gene. Mr. and Mrs. Williams met at a cystic fibrosis information support group. Mr. William's brother died of cystic fibrosis as did his wife's sister, but neither has the disease.

a. What do we know about the Moodys' parents?
Draw a Punnett square to illustrate.
b. What is the chance Mr. Moody is a carrier? Mrs. Moody a carrier? They are both carriers?
c. What is the chance their offspring will have the disease?

Possible answer

[Stan: please install the linking arrow to 'Example 1', that David Schaller has provided, here - pointing right]