UCAT Decision Making 6

Question 1

A logic puzzle: If A is true, B is false. If B is false, C is true. A is true. What is C?

Accepted Answer

True

Answer

False

Answer

Unknown

Answer

The same as A

Question 2

A map shows 3 routes from X to Y. Route 1: 60 km at 60 km/h. Route 2: 80 km at 80 km/h. Route 3: 90 km at 60 km/h. Which is fastest?

Accepted Answer

Routes 1 and 2 are equally fast

Answer

Route 2

Answer

Route 3

Answer

Route 1

Question 3

A company's profit increased by 25% in Year 1 and decreased by 20% in Year 2 from the Year 1 figure. Compared to the start, profit is:

Accepted Answer

The same as the original

Answer

Higher by 5%

Answer

Lower by 5%

Answer

Lower by 10%

Question 4

Four statements about a number N: (1) N is even. (2) N is divisible by 5. (3) N > 20. (4) N < 30. Which number satisfies all four?

Accepted Answer

30 is excluded; the answer is that no number in range works — wait: N=25 is odd. N=20: 20 is even, divisible by 5, but not > 20. So no number satisfies all four.

Answer

25

Answer

20

Answer

30

Question 5

In a population, disease prevalence is 1%. A test has 95% sensitivity and 90% specificity. What is the approximate positive predictive value?

Accepted Answer

About 9%

Answer

About 95%

Answer

About 50%

Answer

About 1%

Question 6

A decision matrix: Option A gives £500 if condition X occurs (P=0.6) and £100 if not. Option B gives £400 regardless. What is the expected value of A?

Accepted Answer

£340

Answer

£500

Answer

£300

Answer

£400

A logic puzzle: If A is true, B is false.If B is false, C is true.A is true.What is C?

A logic puzzle: If A is true, B is false.
If B is false, C is true.
A is true.
What is C?