LIFO Perpetual Inventory

The beginning inventory of merchandise at Dunne Co. and data on purchases and sales for a three-month period ending June 30 are as follows:

Record the inventory, purchases, and cost of merchandise sold data in a perpetual inventory record similar to the one illustrated in Exhibit 4, using the last-in, first-out method. Under LIFO, if units are in inventory at two different costs, enter the units with the HIGHER unit cost first in the Cost of Merchandise Sold Unit Cost column and LOWER unit cost first in the Inventory Unit Cost column.

Activity 1: Tape Electrostatics – Home Experiment

You need the following material for this home activity: Transparent Tape, Aluminum Foil, String, Plastic ruler or Hair Comb, Piece of Wool, or fuzzy fabric.

You may have noticed that when you pull a long strip of transparent tape off a roll, it curls up. You will take advantage of this property to investigate the nature of the charge and electric forces.

• To make the tape strips easy to handle, fold the last 1/2 inch or so over to make a non-sticky tab that you can use as a handle.
• Place an approximately 10-inch long tab strip on a table surface sticky side down and smooth it out flat. This will be the base on which to make a pair of tab strips.

Place two more strips on top of this base, both sticky sides down. Label one tape T for top and the other B for the bottom. Now very slowly peel off both strips as one unit (to minimize charging).

• You will probably find that the pair of strips is mildly attracted to your hand or any nearby surface. If so, lightly and slowly drag the strips across a metal surface several times. This should eliminate the attraction (mostly).

Question 1. Why might bringing the tape in contact with metal make the tape become less attractive?

• Now take the two tabs and quickly rip the two strips apart. With a minimum of handling, hang the two strips about a foot apart off the edge of the table as shown

• Repeat the entire process just described to get two more tape strips labeled T and B. Hang them from the table as well for a total of four strips. Note, if at any time your strips seemed to have “lost” or “changed” their charge, make new T and B strips.

Question 2. How do you think the two T strips will interact if you bring one close to the other; will they attract or repulse each other or do nothing? For now, you can determine if the charged strips have similar or unlike charges. But you cannot determine which one is positive and which one is negative.

Prediction and explanation

Observation (was your prediction correct? If not, why?)

Question 3. How do you think the two B strips will interact if you bring one close to the other?

Prediction and explanation

Observation

Question 4. Using the two B strips, observe the force the strips exert on each other as a function of how far apart they are. You should be able to judge how big the force is by how much the hanging strip is deflected. Does that confirm what Coulomb's law says about force and distance? Explain.

Question 5. How do you think a B and a T strip will interact if you bring one close to the other?

Prediction and explanation   

Observation

Question 6. Now rub the plastic ruler (or hair comb) vigorously with the wool, fur, or fuzzy fabric. How can you tell if the plastic ruler now has a "B-type" charge or a "T-type" charge? Explain your reasoning, what you observe and what you conclude.

Question 7. Suspend a metal (aluminum foil) ball from a string (insulator). Bring the neutral metal ball close to a T strip (without touching it). What do you observe?

Question 8. Bring the neutral metal ball close to a B strip. What do you observe?

Question 9. How is the interaction of the metal ball with the tab strips different from the interaction of the glass or plastic rods with the tab strips?

To explain the basic observation described in questions 7 and 8, consider the following words and pictures. In a metal conductor, the electrons are relatively free to move while the protons are not. Assume that the metal ball starts out neutral, with positive and negative charge evenly distributed, with a net charge of zero.

Question 10. What will the distribution of charges in the ball look like if you bring the ball close to a positively charged tape? Sketch it on the figure.

Question 11. Would the interaction between the tape and ball result in an attractive force, a repulsive force, or no force at all? Carefully explain.

Question 12. How about if instead, you bring the ball close to a negatively charged tape? Sketch the distribution of charges in the ball on the figure.

Question 13. Would the interaction between the tape and ball result in an attractive force, a repulsive force, or no force at all? Carefully explain.

1) A tank is full of water. Find the work W required to pump the water out of the spout. (Use 9.8 m/s² for g. Use 1000 kg/m³ as the weight density of water. Assume that a = 4 m, b = 4 m, c = 12 m,and d = 1 m.)
W = ___ J

I got 5017600 then in scientific notation it would be 5.0176 X 10^6, then in Juls in would be 5.02?

I got the answer wrong an would like to know how you do this problem?

2. Suppose that 5 J of work is needed to stretch a spring from its natural length of 32 cm to a length of 44 cm.

(a) How much work is needed to stretch the spring from 40 cm to 42 cm? (Round your answer to two decimal places.)
1.25 J

(b) How far beyond its natural length will a force of 40 N keep the spring stretched? (Round your answer one decimal place.)
?  cm

for B I got 11.52, did I do something wrong?

PLEASE TYPE all work, and I'll give you a thumbs up!

Mean of stock price = 1117.64

STDEV (Population) = 67.61

1. If a person bought 1 share of Google stock within the last year, what is the probability that the stock on that day closed within $50 of the mean for that year (round to two places)? (Hint: this means the probability of being between 50 below and 50 above the mean).

2. If a person bought 1 share of Google stock within the last year, what is the probability that the stock on that day closed at less than $1050 per share (round to two places)? Would this be considered unusual? Use the definition that an unusual value is more than 2 standard deviations above or below the mean.

3. At what prices would Google have to close in order for it to be considered statistically unusual or statistically significant outliers? You will have a low and high value. There are several possible definitions for unusual in statistics, but for our project let's use the definition that an unusual value is more than 2 standard deviations above or below the mean.

Recall that hexadecimal numbers are constructed using the 16 digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.

(a)

How many strings of hexadecimal digits consist of from one through four digits?

(b)

How many strings of hexadecimal digits consist of from two through five digits?

1. An experiment was done to determine if a pair of dice is “fair”, that is, the probability that each number on each die is the same. Tom tosses the dice 50 times and determines that the mean sum of the sample is 6.6, with a standard deviation of 1. 133. According to the mechanics of tossing two dice, the mean should be 7. Determine if this is a fair dice at the .05 level of significance. Also determine the p-value.

1. Determine if a t or a z hypothesis test should be used.
2. Is this a one-tail or a two-tail hypothesis test?
3. Find H0 and H1.
4. Use both the Classical Approach and the P-Value Approach to determine whether to reject or fail to reject the null hypothesis.
5. Interpret the conclusion.

Answer questions step by step. Also, Add the number on a schedule.

1. Leader Company has two support departments (S1 and S2) and two producing departments (P1 and P2). Estimated direct costs and percentages of services used by these departments are as follows:

        Required:

2. Describe the differences between support and producing departments. Give two examples of each.

Two random samples of 40 students were drawn independently from two populations of students. Assume their aptitude tests are normally distributed (total points = 100). The following statistics regarding their scores in an aptitude test were obtained: xbar1= 76, s1 = 8, xbar2 = 72, and s2 = 6.5.
Test at the 5% significance level to determine whether we can infer that the two population means differ. (Note: You cannot necessarily assume that the populations have the same variances).

Please Solve manually.

Background

An American College conducted a study in the early 2000 to examine if there were any gender pay gaps[1] in its four schools: Business, Health, Liberal Studies and Sciences. Data were collected of a sample of 199 academics on their annual salary, years of service, rank, school, gender and age. The data file: Faculty Salary (Research Report Dataset).xlsx is available on Blackboard. A small portion of the data is shown below:

Legend: There are three academic ranks in the dataset: ASST, ASSO and PROF, which stand for Assistant Professor, Associate Professor and Professor respectively.

Task 1 (Boxplots and t-tests)

(a) Construct separate boxplots of salaries for male and female academics, and compare their distributions (central location, spread and skewness).

(b) Test if male academics on average earn more than their female counterparts at 1%.

                                                                                                                                        (1 mark)

(a) Considering assistant professors only, test if male assistant professors on average earn more than female assistant professors at 1%.

(1 mark)

(b) Considering associate professors only, test if male associate professors on average earn more than female associate professors at 1%.

(1 mark)

(c)   Considering professors only, test if male professors on average earn more than female professors at 1%.

(1 mark)