Showing 33–42 of 42 results

Sale!
Assume that airplanes land independently of one another on a particular runway. If there is an 8% chance that no airplanes land in an hour, what is the probability that six airplanes land in an hour?
$3.00$2.00Question: Assume that airplanes land independently of one another on a particular runway. If there is an 8% chance that no airplanes land in an hour, what is the probability that six airplanes land in an hour?
A: 0.6188
B: 0.7351
C: 0.1515
D: 0.0288

Sale!
An opinion poll asks a simple random sample of 200 United States immigrants how they view their job prospects. In all, 121 say “good.” Does the poll give
$4.00$3.00An opinion poll asks a simple random sample of 200 United States immigrants how they view their job prospects. In all, 121 say “good.” Does the poll give convincing evidence to conclude that more than half of all immigrants think their job prospects are good? If P “the proportion of all immigrants who say their job prospects are good, what are the hypotheses for a test to answer this question.

Sale!
You generate a 95% confidence interval for the mean carapace width of dungeness crabs, which is
$3.00$2.00Question:
You generate a 95% confidence interval for the mean carapace width of dungeness crabs, which is 141 +/18 millimeters. Which answer below could you use to improve your estimate (i.e. make your margin of error smaller)?
 Increase the confidence level to 99%.
 Invoke the Central Limit Theorem.
 Increase the number of crabs in your sample
 Eat one out of every 10 crabs in your sample so that you don’t get hungry while you’re making measurements..

Sale!
Student A is absent 20% of the time and student B is absent 30% of the time. What is the
$3.00$2.00Question: Student A is absent 20% of the time and student B is absent 30% of the time. What is the probability that exactly one of them absent today?

Sale!
G and H are mutually exclusive events. P(G)=0.5 P(H)=0.3. a. Explain
$3.00$2.00Question: G and H are mutually exclusive events. P(G)=0.5 P(H)=0.3. a. Explain why the following statement MUST be false: P(HG)=0.4. b. Find P(H OR G). c. Are G and H independent or dependent events? Explain in a complete sentence.

Sale!
For a population of N = 4 scores with SX = 10 and SX2 = 30, SS = 5. A.True B.False
$2.00$1.00For a population of N = 4 scores with SX = 10 and SX^{2} = 30, SS = 5.
A.True
B.False

Sale!
A study of the ability of individuals to walk in a straight line (” Can we Really walk straight?” Amer. J. of Physical Anthro., 1992: 1927)
$3.00$2.00 
Sale!
Calculated Numeric: A survey of an introductory statistics class in Fall 2003 asked students
$3.00$2.00Quesiton: Calculated Numeric: A survey of an introductory statistics class in Fall 2003 asked students whether or not they ate breakfast the morning of the survey. Results are as follows:
Breakfast Yes No Gender Male 66 66 Female 125 74 What is the probability that a randomly selected student is female? Round to three decimals.

Sale!
A study is conducted to determine if a newly designed text book is more helpful to learning the material than the old edition. the mean score
$5.00$3.00Question: a study is conducted to determine if a newly designed text book is more helpful to learning the material than the old edition. the mean score on the final exam for a course using the old edition is 75. ten randomly selected people who used the new text take the final exam their scores are shown.
person: A,B,C,D,E,F,G,H,I,J
score: 90,74,96,95,89,71,80,86,67,78
Use a 0.01significance level to test the claim that people do better with the new edition. Assume the standard deviation is 10.5. ( Note you may wish to use statistical software).
A.)what kind of test should be used?
1. twosided tail
2. one tailed
3. it does not matter
B.) the test statistic is (rounded to two decimals)
C.) the Pvalue is
D.) is there sufficient evidence to support the claim that people do better than 75 on this exam? Y/N
E.) construct a 99% confidence interval for the mean score for students using the new text. ____<mean<____ 
Sale!
A true/false test has 90 questions. A passing grade is 59% or more correct answers. Find the approximate probability that a person who is just guessing will pass the test.
$2.00$1.00Question: A true/false test has 90 questions. A passing grade is 59% or more correct answers. Find the approximate probability that a person who is just guessing will pass the test.