A function that is bowl-shaped down is called a ___________ ...

[Tazate]

A function that is bowl-shaped down is called a ___________ function.
 a. concave
  b. convex
  c. conic
  d. linear

Question 2

The _____________ is an indication of how frequently interval estimates based on samples of the same size taken from the same population using identical sampling techniques will contain the true value of the parameter we are estimating.
 a. residual b. tolerance factor
  c. confidence level d. accuracy level

[pangili4]

Answer to Question 1

a
RATIONALE: A function that is bowl-shaped down is called a concave function.

Answer to Question 2

c
RATIONALE: The confidence level is an indication of how frequently interval estimates based on samples of the same size taken from the same population using identical sampling techniques will contain the true value of the parameter we are estimating.

[Tazate]

Great answer, keep it coming

[Bigfoot1984]

TYSM