Reference no: EM131009137
1. A study of 98 investment advisors asked them to predict the value of a "penny" stock a week ahead. The correlation between the values predicted and the actual value was 0.20. Was this evidence that they could predict penny stock performance?
a) State the null and alternative hypotheses about the cor- relation.
b) Calculate the test statistic.
c) Perform the test at a = 0.05.
2. For a physical exam to qualify for company-provided insurance, 14 employees had their blood pressure mea- sured. Their Systolic and Diastolic BP are given here;
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SBP
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DBP
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|
140
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90
|
|
208
|
114
|
|
140
|
90
|
|
164
|
104
|
|
142
|
88
|
|
124
|
82
|
|
120
|
80
|
|
142
|
72
|
|
160
|
90
|
|
142
|
98
|
|
225
|
125
|
|
140
|
90
|
|
220
|
114
|
|
150
|
85
|
A regression, found with technology, reports an R2 of 81.3%.
a) Make a scatterplot of the data. Is it appropriate to inter- pret correlation?
b) State the null and alternative hypotheses about the correlation.
c) Calculate the test statistic. (Hint: Remember the relationship between correlation and R2.)
d) Perform the test at a = 0.01 and state your conclusion.
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Problem regarding the online shopping
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Strategic management book
: Read Attachment and summarized the points that interest you. List out your understanding and comments. The paper introduces an integrative view of diversification of scope and global expansion, which are covered by Chapters 7 and 8 in Strategic Man..
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What is the probability that it is conforming
: A system consists of four components connected as shown in the following diagram: If the wafer is from Lot A, what is the probability that it is conforming?
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Regression to predict the sales per person
: In Exercise 9 we saw a regression to predict the sales per person at a movie theater in terms of the time (in min- utes) before the show. The model was:
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Predict penny stock performance
: A study of 98 investment advisors asked them to predict the value of a "penny" stock a week ahead. The correlation between the values predicted and the actual value was 0.20. Was this evidence that they could predict penny stock performance?
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Find the probability that the system functions
: Assume A and B function independently. For the system to function, both components must function. If the probability that A fails is 0.05, and the prob- ability that B fails is 0.03, find the probability that the system functions.
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Increase security in transportation
: Should the government intervene in setting regulations to increase security in transportation (airlines people, water freight, highway freight) and help the environment? Or should private industry take on this role? Discuss.
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Standard deviation of the residuals
: A soap manufacturer tested a standard bar of soap to see how long it would last. A test subject showered with the soap each day for 15 days and recorded the Weight
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Briefly describe the extent of it infrastructure
: Briefly describe the extent of IT infrastructure (hardware, application software, operating system, networks) already present in the day-to-day running of the organisation - Rural and Regional Cuisine Heritage Project
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