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What is distribution variability and how is it linked to accuracy of statistical inference?
The assembly line that produces satellite radios has historically resulted in a 3% defective rate. A random sample of 1000 radios is drawn. What is the probability that the defective rate is great
There are 20 questions on the test. Responces are A,B, C and D. Each question is 5 points and only one response is correct. Suppose The guesses of a student are independant. If the student needs at
The expected life of refrigerators produced by the KeepItCool Company are normally distributed with a mean of 240 months and a standard deviation of 15 months. If the manufacturer wants to have to
Suppose the scores for a particular test are normally distributed with mean 76 and standard deviation 6. The probability that a student will score 89 or higher is:
The average age of vehicles registered in the United States is 96 months. Assume the population is NORMALLY DISTRIBUTED with a standard deviation of 15 months.
The number of available research personnel is 27, and Infocomp would like to avoid obtaining extra researchers. The company would like the expected future annual sales from the implemented projects to
Based on a random sampleof 25 units of a product, the sample mean is 102 pounds, with a standard deviation of 10 pounds. We want to know if there is enough evidence to establish that the average wei
Last year, a soft drink manufacturer had 21% of the market. In an effort to increase their portion of the market, the manufacturer has introduced a new flavor in their soft drinks.
Consider a hypothesis test on a mean of a normally distributed population where the hypothesis are H0: (mean)=10. H1: (mean) > 10 and the characteristicts are n=25, Standard Dev= 2, Alpha =.05 Wh
If you eat a jar of peanut butter in one week what is the probability of consuming 10 rodent hairs from the peanut butter during that week? Assume the number of rodent hairs follow a Poisson distrib
A random sample of 160 commercial customers of PayMor Lumber revealed that 32 had paid their accounts within a month of billing. Can normality be assumed for the sample proportion?
Suppose a sample of 10 observations is taken from a population with a normal distribution. The sample mean is calculated to be xmean=6 with a sample standard deviation of s=1.5. What is the upper t
Data was collected overall fitness before and after a physical fitness program. A higher score is indicitive of better fitness. Given the following data was the program effective. Use the paired t t
Smith Travel Research provides information on the one-night cost of hotel rooms throughout the United States (USA Today, July 8, 2002). Use $2 as the desired margin of error and $22.50 as the planni
A potential investor conducted a 144 day survey in each theater in order to determine the difference between the average daily attendance at the North Mall and South Mall theaters.
Christine Wong has asked Dave and Mike to help her move into a new apartment on Sunday morning. She has asked them both in case one of them does not show up. From past experience, Christine knows th
At a 5% level of significance, test to determine if more than 21% of the population will like the new soft drink. Clearly state your decision and conclusions using the p-value approach.
Determine whether the following statement is true or false, and explain briey: If a simple random sample is taken from a population of registered U.S. voters, the percentage of Republicans in the sa
In a game of chance, a number of draws are made with replacement from a box of tickets; 500 of these tickets are labeled 1 and 450 of these tickets are labeled 1, and the winnings are equal to the s
From the Registrar's data for this year, 25,000 students were enrolled, and 62% were male. Was this sampling procedure like taking a simple random sample? Explain your answer briey.
Using the p value method, test if Vitamin C reduces the average time to recovery.
Samples of our students from an applied experimental design class were polled regarding the number of hours they spent studying for the last exam. All students anonymously submitted the number of ho
An airline has an advertisement that states: "...our passengers always receive their bags within 20 minutes after the plane arrives at the gate." Discuss the hypothesis that they might have used and
A bank manager wishes to provide prompt service for customers at the bank's drive-up window. The bank currently can serve up to 10 customers per 15-minute period without delay. The average arrival r