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Determine whether the tail is on the left side or the right side of the line and find the proportion of the distribution that is located to the left.
a pool of 1004 adults was conducted. 93 5 indicated that alcoholic servie should be refused to those who have had too much to drink. Construct a 95 % confidence interval estimate?
what is the probablity that 16 randomly selected batteries from the population will havea life between 70 and 80.
Which category, groceries or dining out, has a higher population mean annual credit card charge? What is the point estimate of the difference between the population means?
When n = 200, what is the probability that the proportion of couples in the sample who are racially or ethnically mixed will be greater than 0.08?
Of the last 220 applicants, 14 failed the test. Develop a 99 percent interval for the proportion of applicants that fail the test.
From the dataset ECONOMICS TEST SCORES (evening class column 1 and afternoon class column 2) determine if the instructor is correct. If you use StatDisk use the recommended method. Assume no outlier
In a random sample of forty-eight 200-metre swims has a mean time of 3.12 minutes and a standard deviation of 0.09 minutes.
A high-school department made a change in its curriculum. State the null and alternative hypothesis. Confidence intervals of scores and the z or t intervals.
How many observations would the insurance company need? Use the sample standard deviation as a proxy for the population standard deviation and keep the same significance level.
The mean emission of organic pollutants in water is 11.7 million pounds per day in China. Assume that water pollution in China is normally distributed throughout the year with a standard deviation o
What is the probability that a randomly selected viewer will rate the new show as average or better? What is the probability that a randomly selected viewer will rate the new show below average or wor
Using your answer to (a) and the probabilities listed on the flier, what is the standard deviation of the value of the prize won by a prospective customer receiving a flier?
Assume gasoline prices for a region are normallydistributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of confidence.
what are the confidence limits for the proportion that plan to vote for the Democratic incumbent?
Squeezed from each of these apples is approximation normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounces, 77% of the apples will contain at least how many ounces o
A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of
A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 9 students. Their average age was 19.1 years with a standard de
Test the claim that such polygraph results are correct less than 80% of the time. Find the null and alternate hypothesis, test statistic, and P-value. Use the P-Value method to test this claim.
The American Auto Association reports the mean price per gallon of regular gasoline is $3.10 with a population standard deviation of $0.20. Assume a random sample of 16 gasoline stations is selected
Is there evidence of a siginificant difference among the three years in the proportion of respondents who paid for a specific type of purchase with plastic?
As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?
Now, suppose that the company currently has 180 units in stock, and it will not be receiving any further shipments from its supplier for at least 3 weeks. What is the probability that the company wi
A population consists of the following four values: 8, 10, 12, and 16. From this population, there are 6 different samples of size 2. The means of the 6 samples of size 2 are: 9, 10, 12, 11, 13, and
A university has 1000 computers available for students to use. Each computer has a 250 gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of