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Tested for germination in order to estimate p, the true proportion that will germinate, so that the maximum error of the estimate is " = 0:03 with 90% con dence?
Out of the 109 males, 42% preferred Pepsi. Out of the 53 females, 40% preferred Pepsi. Pepsi wanted to test to determine if the males preferred Pepsi more than the females.
With the current price of $39 per share and the random numbers 0.1091, 0.9407, 0.1941, and 0.8083, simulate price per share for the next four 3month periods. What is the ending simulated price per s
Using the .10 significance level, test the significance of the slope. Interpret the result. Is there a significant relationship between the two variables?
If he were to conduct a second study to reduce the maximum error of estimate to 6, about how many hard drives should he include in his new sample.
What would be a good operational definition of the dependent variable in an experiment designed to measure this relationship?
A group of 36 employees is selected at random to participate in a program that allows a flexible work schedule, which the human resources department hopes will decrease the employee absenteeism in t
Does the sample data indicate that the mean account balance has declined from this value? Hint: Use hypothesis testing. What is the p-value? Will the Null hypothesis be rejected at significance leve
Suppose a t- test is being applied to find out if the population monthly expenditure mean is less than $212. The level of significance selected is 1% and 26 accounts are sampled. What is the critica
Which interval is wider? If convenient, use technology to construct the confidence intervals. A random sample of 37 gas grills has a mean price of $644.30 and a standard deviation of $56.50.
10 people get killed by shark attack every year. What is the probability of having 5 or 6 people get killed by shark attack this year?
scientist does n ot believe that water ph is 7. she wants to test the null hypothesis that the true level of ph is 7 at the .05 significance level. her alternative hypothesis is that the water does
A study of the scores on an in-plant course in management principles and the years of service of the employees enrolled in the course yielded the following statistics. For test scores, the mean is 1
Among 12 adults randomly selected from this area, only 3 reported that their health was excellent. Find the probability that when 12 adults are randomly selected, 3 or fewer will report they are in
Tem Rousos, president of Rousos Ford, believes there is a relationship between the number of new cars sold. What are the dependent and independent variables?
electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 s
How does the decrease in confidence affect the sample size required? A 99% confidence level requires (?) subjects. Because a 95% confidence interval is required .04 points. Use a standard normal table
Using z-scores, a population with mean = 37 and standard deviation = 8 is standardized so that the new mean is mean = 50 and standard deviation = 10. How does an individual's z-score in the new dist
The manufacturer of a laser printer reports the mean number of pages a cartridge will print before it needs replacing is 12,325. The distribution of pages printed per cartridge closely follows the n
compared with either employee theft or poor inventory control and that employee theft and poor inventory control are equally likely? Use the 0.01 significance level.
The following data comes from a 2008 paper by Niemiec et al in the European Journal of Epidemiology. Construct a 95% confidence interval for the proportion of CAD patients with M235T.
the following table shows the 2011 murder rates (per100,000 people) for fifteen U.S. cities. find only the appropriate measures of central tendency
10 cobalts are ramdomly selected and the miles per gallon for each car are recorded. what is the probability that the mean miles per gallon exceeds 34 miles per gallon?
A sample of n = 25 individuals is selected from a population with m = 60 and s = 10 and a treatment is administered to the sample. After treatment, the sample mean is M = 63. What is the value of Co
Using the information provided, determine the optimal number of clerks to have on duty each Satyrday to minimize the store's total expected cost.