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If the cost to a patient is in the lower 8% of charges for this medical service, what was the cost of this patient's emergency room visit?
The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will exceed $7500?
Computer-generated output indicates that the p-value for the sample is 0.01. Carefully interpret this p-value. At what levels of significance would you reject the null hypothesis?
Suppose that you wish to test a manager's claim that the proportion of defective items generated by a particular production process has decreased from its long-run historical value of 0.30.
Based on the given information, what is the correct statistical decision in this case? Explain your recommendation.
an election poll reported that a candidate has an approval rating of 54% with a margin of error of 4%. Construct a confidence interval for proportion of adults who approve of the candidate.
A history class is comprised of 5 female and 8 male students. If the instructor of the class randomly chooses 9 students from the class for an oral exam, what is the probability that 2 female studen
To carry out this test, you obtain a random sample of 300 items produced through this process. Computer-generated output indicates that the p-value for the sample is 0.01. Carefully interpret this p
Suppose you bid $12,000. What is the probability that your bid will be accepted? What amount should you bid to maximize the probability that you get the property?
A history class is comprised of female and male students. If the instructor of the class randomly chooses students from the class for an oral exam, what is the probability that female students and m
The mean amount purchased by typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution.
Suppose you do a correlational study with a sample of 50 subjects. What would be the shape of your comparison distribution if you did a t test for r?
Claims that 35% of its graduates are women. in a graduating class of 200 students, 60 were females. at .05 level of significance, can you support the claim?
A normal random variable x has mean of 36.7 and standard deviation 10. Find a value of x that has area 0.1 to its right
Assume data has a normal distrubution and number of observations is greater than fifty. Find the critical z score used to test null hypothesis. alpha =0.01 and two-tailed.
the average length of a long distance telephone call is 28 minutes with a standard deviation of five minuts. assuming the call times are normally distributed, what percentage of calls are longer tha
The population standard deviation is sigma = 60, and you are using a sample of size n = 36. In this situation, the probability of a Type I error (incorrectly rejecting a true null hypothesis) is 5%
The district manager of Jasons, a large discount electronics chain, is investigating why certain stores in her region are performing better than others. She believes that three factors are related t
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (w
A population has a mean of 100 and a standard deviation of 6. A sample of 110 will be taken. What is the probability that the sample mean will be between 108 and 112?
Draw the appropriate conclusions with respect to female and male human resource manager salary levels. Calculate the t value for independent groups for the following data
A politicians claims that at least 70% of the voters in his district agree with his stand on the gun control issue. Test his claim at the 0.03 level of significance. (Note: a random sample of 500 v
Which of the following is not a criterion for choice in decision making under uncertainty?
Make a prediction about opportunities and challenges that an increase in diversity may present in the United States in the next 50 years.
The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years.