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Second Quizlet Example by DS for PSY205
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Gravity
Chapters 1-4 : Gravetter and Wallnau Chapters 1 - 3: Simpson
Terms in this set (20)
Measure of central tendency when distribution is normal and data is at least at an interval level of measurement.
Arithmetic mean
Measure of variability when distribution is normal and data is at least at an interval level of measurement.
Standard deviation
Measure of central tendency when distribution is skewed and unimodal and/or data is at an ordinal level of measurement.
Median
Measure of variability when distribution is skewed and unimodal.
Interquartile range
Measure of variability to report when one calculates a mean.
Standard deviation
Measure of variability found by squaring a standard deviation.
Variance
Approximate percentage of scores found within the range of one standard deviation of a mean
34% + 34% = 68%
Approximate percentage of scores found within the range of two standard deviations from the mean
95%
Examples of measures of central tendency
Mean, median mode
Examples of measures of variability
Range, interquartile range, standard deviation, variance
Middle-most score in an ordered distribution of scores
P.50
Interquartile range
P.25 to P.75
Simple Range
Lowest to highest score
Mu
Mean of a population
Examples of descriptive statistics
measures of central tendency and measures of variability; graphs; tables
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A magnesium-lead alloy is cooled from $600^{\circ} \mathrm{C}$ to $450^{\circ} \mathrm{C}$ and is found to consist of primary $\mathrm{Mg}_{2} \mathrm{Pb}$ and eutectic microconstituents. If the mass fraction of the eutectic microconstituent is 0.28, determine the alloy composition.
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Water is boiled at 1 atm pressure in a coffeemaker equipped with an immersion-type eletric heating element. The coffeemaker initially contains 1 kg of water. Once boiling has begun, it is observed that half of the water in the coffeemaker evaporates in 10 min. If the heat loss from the coffeemaker is negligible, the power rating of the heating element is (a) 3.8 kW (b) 2.2 kW (c) 1.9 kW (d) 1.6 kW (e) 0.8 kW
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A solid square rod is cantilevered at one end. The rod is 0.6 m long and supports a completely reversing transverse load at the other end of $\pm 2 \mathrm{kN}$. The material is AISI 1080 hot-rolled steel. If the rod must support this load for $10^{4}$ cycles with a design factor of 1.5, what dimension should the square cross section have? Neglect any stress concentrations at the support end.
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