The Number of Faulty Items Returned to a Manufacturer of Electric

question 34

Essay

The number of faulty items returned to a manufacturer of electric goods in the last 15 years is as follows: $\begin{array}{ll}\text { Year }&\text { No. of faulty items }\\1996 & 27 \\1997 & 35 \\1998 & 34 \\1999 & 39 \\2000 & 43 \\2001 & 42 \\2002 & 40 \\2003 & 41 \\2004 & 45 \\2005 & 47 \\2006 & 46 \\2007 & 50 \\2008 & 49 \\2009 & 52 \\2010 & 52\end{array}$ a. Construct a relative frequency bar chart for these data.
b. Construct a line chart.

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Definitions:

Significance Level

The probability of rejecting the null hypothesis when it is true, also known as the alpha level, used as a criterion for statistical significance.

Location

A specific position or point in physical or virtual space.

Z-statistic

A type of standard score that indicates how many standard deviations an element is from the mean, used in significance testing.

Significance Level

A threshold for determining whether a p-value indicates a statistically significant result, usually set at 0.05 (5%).