A shipping company handles containers in three different sizes: 1. 27 ft^3 (3 × 3 × 3) 2. 125 ft^3 3. 512 ft^3. Let Xi (i = 1, 2, 3) denote the number of type i containers shipped during a given week. With μi = E(Xi) and σi2 = V(Xi), suppose that the mean values and standard deviations are as follows:μ1= 220 μ2=260 μ3=110 μ1=220 μ2=260 μ3=110σ1=11 σ2=12 σ3=6 σ1=11 σ2=12 σ3=6Required:Assuming that X1, X2, X3 are independent, calculate the expected value and variance of the total volume shipped.

Josie, an unmarried taxpayer, has $155,000 in salary, $10,000 in income from a passive investment in a limited partnership, and a $26,000 passive loss from a real estate rental activity in which she actively participates. if her modified adjusted gross income is $155,000, how much of the $26,000 loss is deductible

Reliability and validity reliability and validity are two important considerations that must be made with any type of data collection. reliability refers to the ability to consistently produce a given result. in the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways. unfortunately, being consistent in measurement does not necessarily mean that you have measured something correctly. to illustrate this concept, consider a kitchen scale that would be used to measure the weight of cereal that you eat in the morning. if the scale is not properly calibrated, it may consistently under- or overestimate the amount of cereal that’s being measured. while the scale is highly reliable in producing consistent results (e. g., the same amount of cereal poured onto the scale produces the same reading each time), those results are incorrect. this is where validity comes into play. validity refers to the extent to which a given instrument or tool accurately measures what it’s supposed to measure. while any valid measure is by necessity reliable, the reverse is not necessarily true. researchers strive to use instruments that are both highly reliable and valid.

Read the following paragraph, and choose the best revision for one of its sentences. dr. blake is retiring at the end of the month. there will be an unoccupied office upon his departure, and it is big in size. because every other office is occupied, we should convert dr. blake’s office into a lounge. it is absolutely essential that this issue is discussed at the next staff meeting. (a) because every other office is occupied, it’s recommended that we should convert dr. blake’s office into a lounge. (b) because every other office is filled, we should convert dr. blake’s office into a lounge.