BIS 245 WEEK 3 ILAB PRACTICE TEST 2026 QUESTIONS WITH ANSWERS GRADED A+

BIS 245 WEEK 3 ILAB PRACTICE TEST 2026
QUESTIONS WITH ANSWERS GRADED A+

◉ Table of Random Digits. Answer: A tool used to select random
samples, where each digit is equally likely and independent of other
digits.


◉ Parameter. Answer: A number that describes a population (often
unknown in practice).


◉ Statistic. Answer: A number that describes a sample; used to
estimate population parameters.


◉ Sampling Variability. Answer: The idea that statistics can vary
from sample to sample.


◉ Bias (Sampling). Answer: Systematic deviation of a statistic from
the parameter in the same direction.


◉ Variability. Answer: How spread out the values of a statistic are
when repeated samples are taken.

, ◉ Proportion. Answer: The percentage of individuals in a group with
a certain characteristic; in samples, this is denoted as p̂ ('p-hat').


◉ Margin of Error (MOE). Answer: Quantifies the uncertainty in an
estimate, showing how much a statistic would vary from sample to
sample.


◉ Confidence Interval. Answer: A range of values that likely contains
the true population parameter, with a certain level of confidence
(e.g., 95%).


◉ Confidence Level. Answer: The probability that the confidence
interval contains the true parameter (commonly 90%, 95%, or
99%).


◉ Reduce bias. Answer: Use random sampling methods.


◉ Reduce variability. Answer: Use large enough sample sizes.


◉ Sampling Error. Answer: Error caused by chance in the selection
of a random sample.