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A normal- shaped distribution has a mean of 80 and standard deviation of 15.
a. What are the z-scores values that from the boundaries for the middle 95% of the distribution of sample means?b. Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
Determine a 90% confidence interval estimate of the mean head circumference of all two-month-old babies.
Assess the model fit for the multiple linear regression model using appropriate statistics and graphics.
The p-value for a test statistic is .085, what is the minimum level of significance required to reject the null hypothesis?
A mean score of 600 and a standard deviation of 100. What credit score defines the top five percent of scores. Within what range would 85% of credit score fall.
One definition of a low-mileage car is one that is 4 years old and has been driven less than 45,000 miles. What percent of the cars returned are considered low-mileage?
Test the hypotheses that the average household income in the township is greater than $100,000. Hint: Start by stating the null and alternative hypotheses.
Ten people agree to take part in an experiment designed to determine whether a persons weight differs between morning & evening.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
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