BUSINESS STATISTICS TEST 2 EXAM
2025/2026 QUESTIONS AND ANSWERS
100% PASS
Cluster sampling - ANS Which of the following methods leads to valid statistical inference?
for any n > 1
σ is always greater than 𝜎_𝑥 ̅ as long as n>1. - ANS 𝜎>𝜎_𝑥 ̅
𝑥 ̅ falls outside 2 standard deviations from the mean. - ANS We suspect that a sample is
biased if
𝑥 ̅ falls outside 3 standard deviations from the mean. - ANS We are almost certain that a
sample is biased if
population standard deviation - ANS 𝜎
the standard deviation of the sample means - ANS 𝜎_𝑥 ̅
a sample standard deviation for a particular sample - ANS s
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, For sample sizes greater than one, the standard deviation of the sample means σ_x ̅ is greater
than the population standard deviation σ - ANS Sampling distribution of x ̅ : Which of the
following is FALSE?
The expected value of the sample means E(x ̅) depends on the sample size n - ANS Sampling
distribution of the sample means x ̅ : Which of the following is FALSE?
We need to know the population standard deviation σ to obtain the standard deviation of the
sample proportions σ_p ̅ - ANS Sampling distribution of the sample proportions p ̅: Which of
the following is FALSE?
For the 1st one, we use σ (Ch 6). For the 2nd one, we use σ_x ̅ (Ch 7) - ANS What is the
probability that a randomly selected individual makes less than $50K a year?
What is the probability that a random sample of 100 individuals show a mean income less than
$50K?
the population mean, regardless of the sample size. - ANS We find that the mean of the
sample means equals
sample size, the smaller the standard deviation of the sample means. - ANS The standard
deviation of the sample means is negatively related to sample size; the larger the
population size. - ANS Where n = sample size, N =
normal distribution if the original population has a normal distribution - ANS The distribution
of all possible sample means has a
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
2025/2026 QUESTIONS AND ANSWERS
100% PASS
Cluster sampling - ANS Which of the following methods leads to valid statistical inference?
for any n > 1
σ is always greater than 𝜎_𝑥 ̅ as long as n>1. - ANS 𝜎>𝜎_𝑥 ̅
𝑥 ̅ falls outside 2 standard deviations from the mean. - ANS We suspect that a sample is
biased if
𝑥 ̅ falls outside 3 standard deviations from the mean. - ANS We are almost certain that a
sample is biased if
population standard deviation - ANS 𝜎
the standard deviation of the sample means - ANS 𝜎_𝑥 ̅
a sample standard deviation for a particular sample - ANS s
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, For sample sizes greater than one, the standard deviation of the sample means σ_x ̅ is greater
than the population standard deviation σ - ANS Sampling distribution of x ̅ : Which of the
following is FALSE?
The expected value of the sample means E(x ̅) depends on the sample size n - ANS Sampling
distribution of the sample means x ̅ : Which of the following is FALSE?
We need to know the population standard deviation σ to obtain the standard deviation of the
sample proportions σ_p ̅ - ANS Sampling distribution of the sample proportions p ̅: Which of
the following is FALSE?
For the 1st one, we use σ (Ch 6). For the 2nd one, we use σ_x ̅ (Ch 7) - ANS What is the
probability that a randomly selected individual makes less than $50K a year?
What is the probability that a random sample of 100 individuals show a mean income less than
$50K?
the population mean, regardless of the sample size. - ANS We find that the mean of the
sample means equals
sample size, the smaller the standard deviation of the sample means. - ANS The standard
deviation of the sample means is negatively related to sample size; the larger the
population size. - ANS Where n = sample size, N =
normal distribution if the original population has a normal distribution - ANS The distribution
of all possible sample means has a
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
