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Question: An increasing number of consumers believe they have to look out for themselves in the marketplace. According to a survey conducted by the Yankelovich Partners for USA WEEKEND magazine, 60% of all consumers have called an 800 or 900 telephone number for information about some product. Suppose a random sample of 25 consumers is contacted and interviewed about their buying habits.
a. What is the probability that 15 or more of these consumers have called an 800 or 900 telephone number for information about some product?
b. What is the probability that more than 20 of these consumers have called an 800 or 900 telephone number for information about some product?
c. What is the probability that fewer than 10 of these consumers have called an 800 or 900 telephone number for information about some product?
in a certain class midterm score average out 60 with an sd of 15 as do scores on the final. the correlation between
a two-variable data set has a correlation coefficient of 0.84. what is the coefficient of determination?a. 0.9165b.
Determine the proportion of homes that have a pool. At the .05 significance level, can we conclude that less than 40 percent of the homes sold in the Denver area had a pool? What is the p-value?
Describe how the confidence intervals will change depending on whether the population standard deviation is known or unknown.
The chi-square statistic for this table is ?2 = 31.765. What null and alternative hypotheses does this statistic test? What are its degrees of freedom?
One objective of this course is learning how to correctly interpret statistical measures.
Containers of yogurt were inspected with regard to the number of days until they expire. 0 represents a yogurt container with today's date. The following table gives the frequency distribution of the number of day's expiry date. Prepare the relati..
Suppose that 20% of all homeowners in an earthquake-prone area of California are insured against earthquake damage. Four homeowners are selected at random; let x denote the number among the four who have earthquake insurance.
discuss a decision familiar to you that can be analyzed by using a decision tree.please answer in at least 3 sentences
Calculate the cell potential and write the overall balanced equation? Cu2+(aq) + 2 e- → Cu(s) E°red = +0.342 V Ti3+(aq) + 3 e-→ Ti(s) E°red = -1.370 V (a) Using the standard reduction potentials given above, predict the standard cell potential o..
Does this mean immigrants tend to earn more than other people? Or does it mean immigrants improve a state's economy? If not, what could explain the correlation?
In the Sci Tools example, use a two-way data table to see how (or whether) the optimal decision changes as the bid cost and the company's production cost.
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