GRADE 11 STATISTICS AND PROBABILITY

What is the possible value of a random variable when three cellphones are tested at random where X is the number of defective cellphones?

• 0,1,2

• 1,2,3

• 0,2,3

• 0,1,2,3

What type of graph is used in representing the sampling distribution of the sample means?

• Bar graph

• Pictogram

• Linear Graph

• Histogram

Which of the following is NOT a property of a normal distribution?

• The area under the curve is 1.

• The distribution is a bell shaped.

• The curve is not symmetrical about its center.

• The mean, median, and the mode coincide at the center.

What do you call a distribution that consists of values a random variable can assume and the corresponding probabilities of the values?

• Discrete Probability Function

• Discrete Probability Distribution

• Random Variable Distribution

• Random Probability Distribution

Which of the following concepts are also known as z-values and confidence coefficients?

• Critical value

• Acceptance value

• Rejection value

• Normal value

Which of the following is a discrete random variable?

• Length of rope

• Voltage of car batteries

• Number of social worker in town

• Amount of paint used in repainting a house

Which of the following is NOT a true statement?

• The sum of all probabilities in a distribution is always one.

• The probability of each random value of a discrete variable is 0≤x≤1.

• The probability of a variable could be zero.

• Random variables can only have one value.

What do you call the element or data that is liable/subject to vary or change?

• Variable

• Sample Space

• Random Variable

• Statistical Experiment

Which of the following is a sampling method in which the population is first divided into strata and then samples are randomly selected from each stratum?

• Simple random

• Systematic

• Stratified

• Cluster

What is the sum of the probabilities of all values of the random variables?

• 0

• 1

• 2

• 3