The Table Below Shows the Mean Number of Daily Errors $\quad$

question 46

Multiple Choice

The table below shows the mean number of daily errors by air traffic controller trainees during the first two weeks on the job. We want to perform a paired t-test at ? = .05 to see if the mean daily errors decreased significantly. $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\text { Trainee }$
$\begin{array}{|c|c|c|c|c|c|c|c|}\hline&\text { T1 } & \text { T2 } & \text { T3 } & \text { T4 } & \text { T5 } & \text { T6 } & T 7 \\\hline \text { Week 1 }&5.1 & 3 & 12.1 & 6.2 & 11.5 & 7.8 & 2.2 \\\hline \text { Week 2}&3.2 & 2.2 & 8.7 & 7.7 & 9.4 & 7.8 & 3.1 \\\hline\end{array}$ The test statistic is:

• A)1.25
• B)1.75
• C)0.87
• D)0.79

Understand the concepts and applications of various measures of central tendency (mean, median, mode) and their strengths and weaknesses.

Comprehend how to conduct basic calculations for descriptive statistics, including rounding procedures.

Recognize the influence of outliers and distribution shapes (e.g., skewed, bimodal) on measures of central tendency.

Distinguish between the uses of measures of central tendency for different data types (nominal, ordinal, interval, ratio).

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Definitions:

Zero Coupon

A bond or debt security that does not pay interest (a coupon) but is traded at a deep discount, providing profit at maturity when the bond is redeemed for its full face value.

Yield

The income return on an investment, such as the interest or dividends received, expressed as an annual percentage of the investment cost.

Original Maturity

The fixed term length at the issuance of a bond or other fixed-income security until it reaches its due date for the repayment of the principal.

Current Yield

Current yield is the annual income (interest or dividends) divided by the current price of the security.