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Suppose a fast food restaurant wishes to estimate average sales volume for a new menu item. The restaurant has analyzed the sales of the items at a similar outlet and observed the following results:
The sample mean was 407 and the sample standard deviation 6. Using the .01 significance level. Compute the value of the test statistic.
In an experiment involving matched pairs, a sample of 13 pairs of observations is collected. The degree of freedom for the t statistic is 11.
A new standarized distribution of m=100 and deviation = 20 find the new standarized score for each of the following values from the original population.
On a toss of a fair die, a person wins $10 if 1 or 3 results, loses $5 if 4 or 6 results, wins $5 if 2 results, and loses $10 if 5 results. Compute the expected value to the person.
A random variable, X, has a probability density function, f(x) = 2x for 0 < x < 1. Find the difference between 10th percentile and the 90th percentile.
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
Test at the .05 level of significance whether the proportion of alumni who support the coach is less than 50 percent.
The table below shows the durations of eruptions, X (in minutes), and the time, Y, until the next eruption of the Old Faithful geyser. We wish to determine whether there is a linear relationship bet
An object is in simple harmonic motion. Find an equation for the motion given that the frequency is 4/π and at time t = 0, y = 0, and y' = 8. What is the equation of motion?
A random variable X follows a normal distribution with a mean of 10 and standard deviation of 3. A standardized value of X was found to be Z = 3. The value of X is then
A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 9. At ? = 0.05 is there enough evidence to reject the researcher's claim? Show all work.
The following table shows the distribution of blood types in the general population. What is the probability a person will have type O blood?
In a study conducted by UCLA, it was found that 30% of college freshmen support increased military spending. If 12 college freshmen are randomly selected, find the probability that more than 5 sele
If the mean plasma-aldosterone level in African American children what was them mean=230 pmol/L with standard deviation which is 203 pmol/L.
Find the probability that a sample of 900 voters would yield a sample proportion in favor of the candidate within 3 percentage points of the actual proportion.
Find the 90% confidence interval for the true difference in proportions for the data in problem above.
A student guesses at each question. Assuming the choices are all equally likely, what is the probability that the student gets all three correct?
A 98% confidence interval estimate for a population mean was computed to be (26.4, 47.8). Determine the mean of the sample, which was used to determine the interval estimate
Find the probability that the mean SAT score for a randomly selected group of 150 11th graders is between 508 and 492.
The average AIMS test scores for two different teachers in Cochise County were 473 (8 students) and 459 (18 students.) The respective deviations were 39.7 and 24.5. Can it be concluded that the ave
Consider a normal population with µ = 25 and ? = 7.0. Calculate the standard score for a value x of 27.
If ten people are picked at random, what is the prob that six will have no flats three will have one flat and one will have two flat tires in the next year?
You find that a random sample of 31 milk containers has a standard deviation of 0.53. Using "alpha" = 0.05, is there enough evidence to reject the Association's claim? Would your conclusion change i
Find the mean, variance, and standard deviation. Please show all of your work