1) What do both a point estimate and an interval estimate have in common?

Group of answer choices

A) They are equally inaccurate

B) They are equally accurate

C) They try to approximate a population parameter

D) They contain a range of possible numbers

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2) From the same sample set, Confidence Interval A was found to be 8-10 while Confidence Interval B was found to be 5-15. Which confidence interval has a higher confidence level?

Group of answer choices

A) Confidence Interval B

B) Confidence Interval A

C) Not enough information to decide

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3) Which of the following are factors that affect the margin of error? More than one may apply.

Group of answer choices

A) Natural logarithm base

B) Mean

C) Sample size

D) Skewness

E) Significance level

F) Standard deviation

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4) Which of the following are properties of the t-distribution? Choose all that apply.

Group of answer choices

A) Approximates the normal distribution for large sample sizes.

B) Variances are greater than 1

C) Bell-shaped, symmetric around the mean

D) It only provides areas to the left.

E) Constituted by a group of curves according to degrees of freedom (sample size)

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5) When would you use the Chi-square distribution to calculate confidence intervals?

Group of answer choices

A) Mean confidence intervals (sigma unknown)

B) Standard deviation confidence intervals

C) Mean confidence intervals (sigma known)

D) Proportion confidence intervals

E) Variance confidence intervals

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6) A sample of 20 students show a mean height of 169 cm with a standard deviation of 18.5 cm. Based on this sample, what is the probability that a sample mean is smaller than 160 cm? Enter the probability as a number between 0 and 1 with 3 decimals.

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7) A sample of 20 students show a mean height of 169 cm with a standard deviation of 18.5 cm. Based on this sample, what is the probability that a sample mean is larger than 177 cm? Enter the probability as a number between 0 and 1 with 3 decimals.