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Cost of breakfast. Sally gets a cup of coffee and a muffin every day for breakfast from one of the many coffee shops in her neighborhood. She picks a coffee shop each morning at random and independently of previous days. The average price of a cup of coffee is $1.40 with a standard deviation of 30¢($0.30), the average price of a muffin is $2.50 with a standard deviation of 15¢, and the two prices are independent of each other.
(a) What is the mean and standard deviation of the amount she spends on breakfast daily?
(b) What is the mean and standard deviation of the amount she spends on breakfast weekly (7 days)?
Suppose a study is conducted to test the claim, at a 0.01 significance level, that less than 75% of college students spend less than $250 per semester on text books. A survey of 700 students found that 71% spent less than $250 per semester on text..
Many companies use sampling to determine whether a batch should be accepted. An (n, c) sampling plan consists of inspecting n randomly chosen items from a batch and accepting the batch if c or fewer sampled items are defective.
in january 2007 consumer reports published their study of bacterial contamination of chicken sold in the u.s. they
STAT201A Assessment - Case Analysis. In general, the board would be interested in how sales are distributed across outlets, how profits are distributed, and where the major growth areas are
a researcher randomly selects a sample of participants from a population with a variance of 4. if the researcher
The scatterplot shows the number of hours of exercise per week and the number of hours of homework per week for some students. Explain what it shows.
Derive the method of moments estimator for p for a sample of size n from a NBinom(s, p)-distribution. (Treat s as known, as it would be in a typical situation
Suppose also that due to liquidity problems, Adelman can give the award to at most three students. Finally, suppose each student chooses a single company.
It declined from 28 percent to 27 percent. Married couples without children at home live in another 29 percent of suburban households. The remaining 15 percent are single-parent homes. Use the given information on type of household in 2000 to con..
You were hired to do the development work for the local high school. The school has asked you to create a program to store quiz grades for the students of a class.
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out-of-pocket? Write your hypotheses and decision rule.
Suppose that an odd number of individuals have single-peak preferences. Explain why the most- preferred alternative of the median voter will defeat every other proposal by a majority votes
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