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A group of 49 randomly chosen students has mean age of 22.4 years with population standard deviation of 3.8. Construct a 98% confidence interval for the population mean.
Determine the chi-square critical value for 13 degrees of freedom when a= 0.05 and the test is one-tailed right?
A current gasoline survey said that national average gasoline price was $1.298 a gallon. It was felt that gasoline in Texas was significantly lower than the national average. A survey of 7 different
A poll stated that 32% of those polled think economy is getting worse. An economist wanted to check this claim so she surveyed 750 people and found that 30% of them thought economy is getting worse.
To compare the users of Twitter to those of Facebook, the sociologist asked another 10 students to indicate the number of times they log in to their Facebook account each month. The average number o
A survey of 254 landscaping companies showed that 155 of them advertised in newspaper A, 152 advertised in newspaper B, and 110 advertised in both. Determine the probability that a landscaping compa
A bank tells the real estate agent that average closing costs on the sale of a home are $6500. The agent thinks that this is too low
What is the chi-square critical value for 13 degrees of freedom when a= 0.01 and the test is one-tailed right?
A recent report from the American Medical Association claims that for the first time in 10 years, the average salary of a psychiatrist has decreased.
Assume a population has mean weight of 180 pounds and standard deviation of 25 pounds. A sample of 100 items is drawn from this population. Determine the standard error of the mean?
An significant factor in selling residential property is the number of people who look through the home. A sample of 16 homes recently sold in the Buffalo, New York, area revealed the mean number lo
Bob Nale is the owner of Nale's Quick Fill. Bob would like to determine the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distributio
The owner of Britten's Egg Farm wants to determine the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 24 eggs per month with a standard deviation of 2.73
Assume the U.S. president wants estimate of the proportion of population who support his current policy toward revisions in Social Security system. The president desires the determine to be in 0.03
To find the sample size needed for a hypothesis test given: Ho: mu = 10, Ha: mu not equal to 10, sigma is unknown, alpha = 0.05, beta = 0.01, E = (.5)sigma, find the following:
Determine the probability of selecting a random position and inserting the card, with the result that the card is inserted correctly?
Let's look at an example of results from the hypothesis test using the p-value method with an alpha of 0.01.
Two separate samples are being employed to determine the population mean difference between two treatment conditions. Which of the following would produce the widest confidence interval?
For the following data from a repeated-measures study, the sample mean difference is MD = 4.
For which of following situations would a repeated-measures research design be appropriate?
Which of the following samples will produce the largest value for a t statistic? Assume each sample has n=10 scores.
For which of the following situations would a repeated-measures design have the maximum advantage over an independent-measures design?
The number of errors in each game was recorded and is listed here. Can we infer that there are fewer errors upon average when the yellow ball is used?
Studies have shown that males tend to score higher upon measures of self-esteem. A study found a sample of 10 males to score M = 39.00, SS = 60.20 whereas the sample of 10 females scored 35.40, SS =
In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The management of Rock City recently undertook an extensive promotional campaign. They are interested in determining w