The values listed below are waiting times (in minutes) of customers at two different banks. At Bank A, customers enter a single waiting line that feeds three teller windows. At Bank B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions. Bank A 6.4 6.6 6.7 6.8 7.1 7.3 7.4 7.7 7.7 7.7 Bank B 4.1 5.3 5.9 6.2 6.8 7.6 7.6 8.4 9.4 10
Construct a 99% confidence interval for the population standard deviation σ at Bank A.
In: Statistics and Probability
The values listed below are waiting times (in minutes) of customers at two different banks. At Bank A, customers enter a single waiting line that feeds three teller windows. At Bank B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions.
Bank A 6.5 6.6 6.7 6.8 7.1 7.3 7.6 7.9 7.9 7.9
Bank Upper B 4.3 5.3 5.9 6.2 6.8 7.8 7.8 8.4 9.2 10.0
Construct a 95% confidence interval for the population standard deviation at Bank A
In: Statistics and Probability
You have discovered a new species of insect while hiking around the BioReserve! Based on the fruit fly and other insects, you know that larvae have patches of cells known as “imaginal discs,” each of which will contribute to an appendage of the adult (e.g. antenna, wing, or leg). Moreover, you know that the decapentaplegic(dpp) gene is expressed in the imaginal discs that contribute to the wings, but not in those that contribute to the antennae or legs. For each of the following questions, limit your response to three sentences.
a) Describe one strategy to identify the patch of cells that give rise to wings in your species.
b) Describe one strategy to confirm that dpp is expressedby cells that give rise to wings in your species.
c) Describe one strategy to confirm that dpp is requiredfor wing development in your species. Be sure to provide a brief description of the relevant technique(s), and to include at least one control.
Describe one strategy to confirm that dppexpression is sufficientfor wing development in your species. Be sure to provide a brief description of the relevant technique(s), and to include at least one control. 6 pts
In: Biology
In: Accounting
Table 14-9
Suppose that a firm in a competitive market faces the following
revenues and costs:
Quantity | Total Revenue | Total Cost |
0 | $0 | $10 |
1 | $9 | $14 |
2 | $18 | $19 |
3 | $27 | $25 |
4 | $36 | $32 |
5 | $45 | $40 |
6 | $54 | $49 |
7 | $63 | $59 |
8 | $72 | $70 |
9 | $81 | $82 |
Refer to Table 14-9. If the firm produces 4 units
of output,
| a)marginal revenue is less than marginal cost. | |
| b)marginal cost is $4. | |
| c)the firm is maximizing profit. | |
| d)total revenue is greater than variable cost. |
In: Economics
In: Economics
For the accompanying data set, (a) draw a scatter diagram of the data, (b) by hand, compute the correlation coefficient, and (c) determine whether there is a linear relation between x and y.
|
n |
|
|---|---|
|
3 |
0.997 |
|
4 |
0.950 |
|
5 |
0.878 |
|
6 |
0.811 |
|
7 |
0.754 |
|
8 |
0.707 |
|
9 |
0.666 |
|
10 |
0.632 |
|
11 |
0.602 |
|
12 |
0.576 |
|
13 |
0.553 |
|
14 |
0.532 |
|
15 |
0.514 |
|
16 |
0.497 |
|
17 |
0.482 |
|
18 |
0.468 |
|
19 |
0.456 |
|
20 |
0.444 |
|
21 |
0.433 |
|
22 |
0.423 |
|
23 |
0.413 |
|
24 |
0.404 |
|
25 |
0.396 |
|
26 |
0.388 |
|
27 |
0.381 |
|
28 |
0.374 |
|
29 |
0.367 |
|
30 |
0.361 |
|
n |
(b) By hand, compute the correlation coefficient.
The correlation coefficient is r= ____. (Round to three decimal places as needed.)
(c) Determine whether there is a linear relation between x and y.
Because the correlation coefficient is (positive,negative) and the absolute value of the correlation coefficient, _____, is (greater,not greater) than the critical value for this data set,_____,(a negative,a positive, no) linear relation exists between x and y. (Round to three decimal places as needed.)
In: Statistics and Probability
Suppose that 74% of all adults think that the overall safety of airline travel is either good or excellent. An opinion poll plans to ask an SRS of 1097 adults about airplane safety. The proportion of the sample who think that the overall safety of airline travel is either good or excellent will vary if we take many samples from this same population. The sampling distribution of the sample proportion is approximately Normal with mean 0.74 and standard deviation about 0.012. Sketch this Normal curve and use it to answer the following questions. (Round your answers to three decimal places.)
(a) What is the probability that the poll gets a sample in which more than 76.4% of the people think that the overall safety of airline travel is either good or excellent?
(b) What is the probability of getting a sample that misses the truth (74%) by 2.4% or more?
In: Statistics and Probability
A group of students estimated the length of one minute without reference to a watch or clock, and the times (seconds) are listed below. Use a 0.10 significance level to test the claim that these times are from a population with a mean equal to 60 seconds. Does it appear that students are reasonably good at estimating one minute?
|
80 |
93 |
46 |
76 |
53 |
31 |
69 |
74 |
74 |
54 |
76 |
76 |
103 |
100 |
76 |
What are the null and alternative hypotheses?
Determine the test statistic. Round to two decimal places.
Determine the P-value. Round to three decimal places.
State the final conclusion that addresses the original claim.
______ H0. There is ______ evidence to conclude that the original claim that the mean of the population of estimated is 60 seconds _______ correct. It ________ that as a group the students are reasonably good at estimating one minute.
In: Statistics and Probability
In: Operations Management