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Question: Explain whether each of the following situations meets the conditions for which the Rule for Sample Proportions applies. If not, explain which condition is violated.
a. Unknown to the government, 10% of all cars in a certain city do not meet appropriate emissions standards. The government wants to estimate that percentage, so they take a random sample of 30 cars and compute the sample proportion that do not meet the standards.
b. The Census Bureau would like to estimate what proportion of households have someone at home between 7 P.M. and 7:30 P.M. on weeknights, to determine whether that would be an efficient time to collect census data. The Bureau surveys a random sample of 2000 households and visits them during that time to see whether someone is at home.
c. You are interested in knowing what proportion of days in typical years have rain or snow in the area where you live. For the months of January and February, you record whether there is rain or snow each day, and then you calculate the proportion.
d. A large company wants to determine what proportion of its employees are interested in on-site day care. The company asks a random sample of 100 employees and calculates the sample proportion who are interested.
What can retailers do to ensure good service? Other than the product itself, what can retailers do to offer value to customers?
Suppose a 10-foot wave is considered to be the storm threshold. What wind speed yields an expected storm threshold?
Some campus romances are episodes plagued by violence. Therefore, some campus romances are not episodes plagued by violence.
Implantable heart pacemakers contain small circuit boards called substrates. These substrates are assembled, cut to shape, and fired. Some of the substrates will separate, or delaminate, making them useless.
Several drugs are used to treat diabetes. A sales specialist for a leading pharmaceutical company randomly sampled the records of 10 sales districts to estimate the number of new prescriptions that had been written during a particular month for he..
How many bulbs should be tested so that we can be 90% confident that the estimate of the mean will not differ from the true mean life by more than 10 hours?
Conduct a hypothesis test to determine if the goal can be reached. Use a significance level of 0.05 and the p-value approach.
Customers arrive into a queue, where they are served, and then depart. We model the time between two successive arrivals by an exponential distribution with an arrival rate l=9.
To accomplish this goal, perform the following operations on the attached Excel data: Calculate the average Quiz Score [i.e. (points earned)/(points available)] for each student and Calculate the average Lab Report Score [i.e. (points earned)/(points..
Are these events mutually exclusive? Why or why not? What is the probability of eating potato salad given that a person was a case? Show your work
Normal distribution with a mean of 8.1 minutes and a standard deviation of 1.9 minutes. For a randomly received emergency call, find the following probabilities. The response time is between 5 and 10 minutes
The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.
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