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The manager of grocery store has taken random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation
In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The management of Rock City currently undertook extensive promotional campaign.
The summer monsoon rains in india follow a normal distribution with mean 852mmof rainfall and standard deviation of 82mm.
The regression equation is ?? = 30 + 2.56X, the sample size is 14, and the standard error of the slope is 0.97. What is the critical value to test the significance of the slope at the 0.05 significa
Which of the following is NOT a difference between a confidence interval and a prediction interval?
The heights of women aged 20-29 are approximately Normal with mean 64 inchs and standard deviation 2.7 inches. Men the same age have heights that are also approximately Normal with mean height 69.3
A binomial distribution has 100 trials (n = 100) with a probability of success of 0.25 (?=0.25). We would like to find the probability of 34 or more successes using the normal distribution to approx
We would like to find the probability of 34 or more successes using the normal distribution to approximate the binomial. Applying the continuity correction factor, what z-score should be used?
A binomial distribution has 50 trials (n = 50) with a probability of success of 0.50 (?=0.50). We would like to find the probability of 34 or more successes using the normal distribution to approxim
The Intelligence Quotient (IQ) test scores are normally distributed with mean of 100 and standard deviation of 15. You enrolled in class of 25 students. Determine the probability that the class' ave
If an average of 12 customers is served per hour, what is the probability that the next customer will arrive in 3 minutes or less?
Mozart music is administered to each and every individual in the sample for 20 minutes. After which each individual is given spatial task. The average score for the treated sample is M = 86 with SS
A mood questionnaire has been standardized so that the scores from a normal distribution with µ = 50 and ? = 15. A psychologist would like to use this test to examine how the environment affec
A random sample of n = 9 individuals is obtained from population with mean of µ = 80, the population variance is unknown. Researcher wants to if listening to Mozart Music improves spatial skil
Anorexia in teenage girls. A study compared various therapies for teenage girls suffering from anorexia. For each girl, weight was measured before and after a fixed period of treatment.
Of the adults in Jefferson county, 10% have had CPR training. For a randomly chosen group of adults from the county, how large would the group have to be in order for the probability that at least o
A study of corporate business costs was conducted to find if there was difference between the average amount spent on dinner by executives and the average amount spent on dinner by managers.
Of the adults in Jefferson county, 10% have had CPR training. For a randomly selected group of adults from the county, how large would the group have to be in order for the probability that at least
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.
In random sample of 80 items, the defect rate is 5% but the manager claims that this is only sample fluctuation and production is not really out of control. At the 0.01 level of significance, do the
An introductory psychology class has 9 freshman males, 15 freshman females, 8 sophomore males, and 12 sophomore females. If one student is randomly chosen from this class, determine the probability
Thus, sample statistics are usually not identical to their corresponding population parameters. The error or discrepancy between a statistic and the corresponding parameter is called sampling error.
What is needed by the homogeneity of variance assumption? The pooled variance has a value between the two sample variances.
A machine produces nails with the target mean length of 3 inches and historical standard deviation of 0.09 inches. A sample of 30 nails is selected, and it is found that the sample mean is 2.90 inch
The daily intakes of milk (in ounces) for ten randomly selected people were: