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A well-known brokerage firm executive claimed that at least 90% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 800 people, 88% of them said they are confident of meeting their goals.
For this claim state the null and alternative hypothesis as an expression:
State the null hypothesis as a complete sentence:
State the alternative hypothesis as a complete sentence:
How could we re-write the claim to make this a two-tail test?
Suppose that a scientist desires to estimate the proportion? of monarch butterflies with a special type of marking on their wings. Suppose he captures monarch butterflies one at a time, and at the end of the day the scientist had captured 60 monar..
A die is made of a cube with a square painted on one side, a circle on two sides, and a triangle on three sides.
Create a frequency distribution column graph of the 100 Sum observations below by determining the Sample Space for the RV; so, the bins for the column graph will be the unique sample space values of the graph.robability of a customer purchase being..
assume that the significance level is a0.05. use the given information to find the p value and the critical values.
A group of professors investigated first-year college students' knowledge of astronomy. One concept of interest was the Big Bang theory of the creation of the universe.
What is the probability that a candidate is over 60 and female? Given that the candidate is male, what is the probability he is less than 60? Given that the person is over 60, what is the probability the person is female?
The percent of persons residing in that county, by age. Use the population distribution to find the expected juror frequencies. Test the researcher's claim at α = 0.01.
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
Compute the value of the Pearsonian coefficient of skewness and discuss the meaning of it. Is the distribution skewed? If so, to what extent?
Assuming normality, conduct the appropriate hypothesis test to determine whether there is any difference in the population mean moisture content of bulk grain measured by chemical reaction and by distillation. Use a = 0.05.
A five-star hotel accepts 100 room reservations daily. For each reservation accepted, there is a 7% chance that the guest will not arrive.
What was the rate of inflation for the 1950's, as measured by the percentage change in the CPI?
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