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Is the value t = 2.12 statistically significant at the 10% level? At the 5% level?
The one-sample t statistic from a sample of n = 15 observations for the two-sided test of
Find the mean of this sampling distribution of sample means. Find the standard error of the mean of this sampling distribution of sample means.
In one college, heights of male students are approximately normally distributed with a mean of 68 inches and standard deviation of 4 inches. A random sample of 36 students is obtained and the heigh
The proportion of all children that drew the nickel too small is: redx.gif Assume that this proportion is true for ALL children (e.g. that this proportion applies to any group of children), and that
Give an example of how you may use a correlation or simple regression to examine the relationship between two variables in your area of interest. State the null and alternative hypothesis and clearl
A study of commuting times reports the travel times to work of a random sample of 18 employed adults in New York State. The mean is x= 25.46 minutes and the standard deviation is s = 20.8 minutes.
To address this question, the professor gathers information from the students in an undergraduate course and calculates their propensity for cooperating with the police (higher number means higher l
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days. If a gestation period of 276 days, what percentile among human
Test the significance of the correlation coefficient r at a = 0.05 for the data below.
Compute the standard error of the estimate for the data below.
A multiple regression line was calculated in which x1 was a student's grade point average and x2 was a student's age. The multiple regression line was calculated as y' = -18.7 + 46.3 x1 + 7.28 x2. I
What are the appropriate null and alternative hypotheses for this analysis? Using ?=0.05, what is your conclusion about the equality of population means all four coupons?
What is the value of y' when x = 3, if the equation of the regression line is y' = 23.1 - 3.8x ?
Compute the standard error of the estimate for the data below. X values 56 68 78 85 98 Y values 87 110 138 161 186
If in an observational study the statistical analysis has shown convincing evidence that the mean levels differed in two groups (treatment and control groups), can one conclude that the treatment wa
Answer the following questions by checking either True or False. All other factors remaining the same, a 90% confidence interval is more narrow than a 95% confidence interval.
Assume that you have a box with an equal number of $4, $6, $8 chips. a. Find the population mean and the standard deviation.
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At alpha= .05, is a difference in the two amounts?
At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportion of students who have ear infections at one school and the other?