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A two-sample t test is going to be carried out where it is assumed that the population variances are unknown but assumed equal. The first sample of 30 items were chosen and measured. For this first sample, an average response of 125 with a sample variance of 25 was found. The second sample of 40 items were chosen and measured. This second sample had an average response of 132 with a sample variance of 16. What is the pooled standard deviation for this problem? (rounded to second place after the decimal)
A. 4.45
B. 19.84
C. 413.37
D. 20.33
If employee is chosen at random, determine these probabilities.The Employee smokes, The employees smokes, given that he/she graduated from college.
samples and statistical inferencestatistics deals with data. the quality of statistical inference depends on the
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
I believe this can be done by plotting out every 3 years average number of people working past 65 since 1997 until now and then making a predictability study as to number of people who will be working over the age of 65 in 2012.
Critically discuss why you would or would not expect each of the following variables to be normally distributed.
Test the hypothesis that the annual incomes of corporate trainers in areas of more than 500,000 are significantly more than those in areas of less than 100,000.
If an auditor takes a random sample of 36 accounts what is the probability that the mean balance will be less than 45?
for any normal distribution what z-score separates the highest 80 of the scores from the rest of the distribution?
a common mistake many statistics students make is saying we accept the null or prove the null instead of fail to
Find the probability that in a given winter month at least 140 cars will be rented. Use the normal distribution to approximate the binomial distribution.
Compute the variance and standard deviation
A sample of 70 orders revealed that 57 were delivered in promised time. At .02 significance level, can we conclude that less than 87 percent of orders are delivered in less than 10 minutes?
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