A researcher plans to conduct a marketing experiment to decide which shampoo has the better floral scent considering only two brands, "red" shampoo or "pink" shampoo. A sample of 190 people were chosen assuming that they can distinguish between the different scents. What are the symmetrical limits of the population percentage within which the sample percentage is contained with a probability of 90%?
In: Statistics and Probability
In a study of the accuracy of fast food drive-through orders, Restaurant A had 286 accurate orders and 70 that were not accurate. a. Construct a 90% confidence interval estimate of the percentage of orders that are not accurate. b. Compare the results from part (a) to this 90% confidence interval for the percentage of orders that are not accurate at Restaurant B: 0.176less thanpless than0.248. What do you conclude?
In: Statistics and Probability
A college wishes to know the proportion of American adults who are bilingual. The survey includes asking 280 randomly selected American adults and finds that 123 are bilingual.
In: Statistics and Probability
A controversial topic in Spring 2020 is a national debate concerning whether Americans should be legally required to "shelter in place" during the virus epidemic. How many Americans should be polled to determine the percentage of all Americans who agree with the legal requirement correct to within 2 percentage points with 99% confidence? (Enter a single number with no other symbols.)
In: Statistics and Probability
In a study of the accuracy of fast food drive-through orders, Restaurant A had 206 accurate orders and 58 that were not accurate. a. Construct a 90% confidence interval estimate of the percentage of orders that are not accurate. b. Compare the results from part (a) to this 90% confidence interval for the percentage of orders that are not accurate at Restaurant B: 0.205 < p < 0.283. What do you conclude?
In: Statistics and Probability
The heights of women aged 18– 24 are approximately Normal with mean 65 inches and standard deviation 2.5 inches.
A) What range contains the middle 95% of women heights?
B) What percentage of women is taller than 67.5 inches?
C) What percentage of women are taller than 70 inches?
D) How tall are the tallest 5% of women?
In: Statistics and Probability
A hospital director is told that 31% of the treated patients are uninsured. The director wants to test the claim that the percentage of uninsured patients is less than the expected percentage. A sample of 380 patients found that 95 were uninsured. Make the decision to reject or fail to reject the null hypothesis at the 0.05 level. a. reject null hypotheses or b. fail to reject null hypotheses
In: Statistics and Probability
A hospital director is told that 44% of the emergency room visitors are uninsured. The director wants to test the claim that the percentage of uninsured patients is above the expected percentage. A sample of 360 patients found that 180 were uninsured. At the 0.02 level, is there enough evidence to support the director's claim?
Step 4 of 6 : Determine the decision rule for rejecting the null hypothesis, H0 .
In: Statistics and Probability
Suppose the weights of Farmer Carl's potatoes are normally
distributed with a mean of 8.0 ounces and a standard deviation of
1.1 ounces.
Suppose Carl bags his potatoes in randomly selected groups of 6.
What percentage of these bags should have a mean potato weight
between 7.5 and 8.5 ounces? Enter your answer as a
percentage rounded to one decimal place.
In: Statistics and Probability
Suppose an individual invests $10,000 in equity ownership of a public corporation. A year later, the corporation files for bankruptcy, owing hundreds of thousands of dollars to debtholders. What is the maximum loss this individual will take?
a) $10,000 plus a portion of the unpaid debt.
b) $0
c) $10,000
d) A percentage of the unpaid debt depending on the percentage of equity ownership.
e) None of the above.
In: Finance