Fusible interlinings are being used with increasing frequencyto support outer fabrics and improve the shape anddrape of various pieces of clothing. The articleCompatibility of Outer and Fusible InterliningFabrics in Tailored Garments (Textile Res. J., 1997:137142) gave the accompanying data on extensibility(%) at 100 gm/cm for both high-quality (H) fabric andpoor-quality (P) fabric specimens.H 1.2 .9 .7 1.0 1.7 1.7 1.1 .9 1.7 1.9 1.3 2.1 1.6 1.8 1.4 1.3 1.9 1.6 .8 2.0 1.7 1.6 2.3 2.0P 1.6 1.5 1.1 2.1 1.5 1.3 1.0 2.6a. Construct normal probability plots to verify the plausibilityof both samples having been selected fromnormal population distributions.b. Construct a comparative boxplot. Does it suggestthat there is a difference between true averageextensibility for high-quality fabric specimens andthat for poor-quality specimens?c. The sample mean and standard deviation for the highqualitysample are 1.508 and .444, respectively, andthose for the poor-quality sample are 1.588 and .530.Use the two-sample t test to decide whether true averageextensibility differs for the two types of fabric.
Stats notes 1 Population- includes all individuals or objects of interest Sample- subset of the population EXAMPLE: Population: all 3,000 the people attending a concert Sample: a small section of 500 people that attended Cases- what we’re obtaining information on Variables- any characteristic that is recorded for each case Types of variables: Categorical- divides cases into groups Quantitative- measures or records a numerical quantity for each case Explanatory- what is the reason for what happened Response- the outcome Nominal- groups that do not have any order EX- eye color, religion Ordina