Suppose you believe the strength of the linear association between weight (lbs) and sleep (average per night), r1=-0.2 is significantly different than the association between weight and exercise (hours per week), r2=-.25.
What is the required sample size required to assess whether the two correlations are significantly different? Assume alpha = 0.05 and beta = 0.1.
In: Statistics and Probability
Suppose we are interested in studying whether exposure to a pesticide increases the risk of prostate cancer. Assume that 20% of controls are exposed to the pesticide and we wish to detect an odds ratio of 2.7 from the exposure. Note that p2 = 0.2 and we need to calculate p1. How many cases and how many controls are needed in your case-control study?
In: Statistics and Probability
A guy pushes a box of mass 10kg along an inclined plane of 15.0. The coefficient of kinetic friction is 0.2. The man gives a force of 50N on the box along the inclined plane and the box goes through a displacement of 2m. Find:
a) the net work done on the box
b) if the guy takes 2 minutes to move the box 2m, then find his power
In: Physics
The index model has been estimated for the returns of stocks A
and B, denoted by R_A and R_B, on the return on the market denoted
by R_M, with the following results:
R_A = 0.01 + 0.8R_M + e_A.
R_B = 0.02 + 1.2R_M + e_B.
The standard deviation of market returns is 0.2; the idiosyncratic
risk (standard deviation of e_A) of stock A is 0.10; and that for
stock B is 0.20.
The standard deviation for stock A is
In: Finance
37) A pendulum whose period in a vacuum is 2.3 second is placed in a resistive medium. Its amplitude on each swing is observed to be half that on the previous swing. What is its new period? Given that the pendulum bob is of mass 0.2 kg, and is subjected to a periodic force of amplitude 0.5 N and period 1 s, find the angular amplitude of the resulting forced oscillation.
In: Physics
Thompson and Thompson is a steel bolts manufacturing company. Their current steel bolts have a mean diameter of 143 millimeters, and a standard deviation of 5. If a random sample of 47 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by more than 0.2 millimeters? Round your answer to four decimal places
In: Statistics and Probability
A certain manufactured product is supposed to contain 23% potassium by weight. A sample of 10 specimens of this product had an average percentage of 23.2 with a standard deviation of 0.2. If the mean percentage is found to differ from 23, the manufacturing process will be recalibrated.
a) State the appropriate null and alternate hypotheses.
b) Compute the P-value.
c) Should the process be recalibrated? Explain.
In: Statistics and Probability
An acute viral disease infects a population of chipmunks, and only those homozygous for allele b are resistant. (Those individuals heterozygous or homozygous for allele B are susceptible and suffer 100% mortality).
A. If the initial frequency of allele b=0.2, what is the frequency (ignoring mutation) one generation after the introduction of this disease?
B. What is the mechanism of evolutionary change in this example?
In: Biology
Problem 9-14A Measures of Internal Business Process Performance [LO9-3]
|
DataSpan, Inc., automated its plant at the start of the current year and installed a flexible manufacturing system. The company is also evaluating its suppliers and moving toward Lean Production. Many adjustment problems have been encountered, including problems relating to performance measurement. After much study, the company has decided to use the performance measures below, and it has gathered data relating to these measures for the first four months of operations. |
|
Month |
|||||
| 1 | 2 | 3 | 4 | ||
| Throughput time (days) | ? | ? | ? | ? | |
| Delivery cycle time (days) | ? | ? | ? | ? | |
| Manufacturing cycle efficiency (MCE) | ? | ? | ? | ? | |
| Percentage of on-time deliveries | 77% | 78% | 83% | 90% | |
| Total sales (units) | 10,550 | 10,560 | 10,510 | 10,500 | |
Management has asked for your help in computing throughput time, delivery cycle time, and MCE. The following average times have been logged over the last four months:
|
Average per Month (in days) |
|||||||||
| 1 | 2 | 3 | 4 | ||||||
| Move time per unit | 0.8 | 0.5 | 0.4 | 0.5 | |||||
| Process time per unit | 0.3 | 0.5 | 0.5 | 0.4 | |||||
|
Wait time per order before start |
9.2 | 9.0 | 5.0 | 4.0 | |||||
| Queue time per unit | 3.6 | 3.9 | 2.3 | 1.1 | |||||
| Inspection time per unit | 0.7 | 0.6 | 0.5 | 0.5 | |||||
| Required: | |
| 1-a. | Compute the throughput time for each month. (Round your answers to 1 decimal place.) |
|
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| 1-b. |
Compute the manufacturing cycle efficiency (MCE) for each month. (Round your answers to 1 decimal place (i.e., 0.123 should be entered as 12.3).)
Problem 9-17A Comparison of Performance Using Return on Investment (ROI) [LO9-1]
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In: Accounting
PLEASE EXPLAIN WHY YOU CHOOSE EACH ANSWER
1). How many distinct ways can a President, Vice President, Secretary and Treasurer be selected from a group of 10 people if no one can hold more than on position?
A). P(10,4)
B). 10 choose 4
C). 10^4
D). 4^10
E). 13 choose 10
F). None of these
2). How many shortest lattice paths are there from (0,0) to (10,4)
A). P(10,4)
B). 10 choose 4
C). 10^4
D). 4^10
E). 13 choose 10
F). None of these
3). At a movie theater with 4 different movies, how many ways can 10 people select a show? They do not have to all go to the same shoe but several poeple can go to the same show.
A). P(10,4)
B). 10 choose 4
C). 10^4
D). 4^10
E). 13 choose 10
F). None of these
In: Advanced Math