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A manufacturer of tires wants to advertise a mileage interval that ex-cludes no more than 10% of the mileage on tires he sells. All he knowsis that, for a large number of tires tested, the mean mileage was 25,000miles, and the standard deviation was 4000 miles. What interval wouldyou suggest?
General
2 months ago
Geoff has been running a restaurant in the city for many years. He knows from experience that the proportion of customers that leave tips at this restaurant is 0.56. Geoff has recently opened a restaurant in a suburban area. It seems that tipping habits are different in the suburbs: Geoff believes that the proportion of customers that tip at his new restaurant (p) may be different to 0.56. He conducts a hypothesis test to find out. The null and alternative hypotheses are: H0: p = 0.56 Ha: p ≠ 0.56 Geoff takes a random sample of 113 customers and notes whether or not they leave a tip. In this sample, the proportion of people that leave a tip is 0.60. a)Calculate the test statistic (z). Give your answer to 2 decimal places. z = 0.857 b)Calculate the P-value. Give your answer as a decimal to 4 decimal places. P-value = 0.3898
General
2 months ago
The popularity of computer, video, online, and virtual reality games has raised concerns about their ability to negatively impact youth. The data in this exercise are based on a recent survey of 14 ‑ to 18 ‑year‑olds in Connecticut high schools. Assume the table displays the grade distributions of boys who have and have not played video games. Grade Average A's and B's C's D's and F's Played games 730 444 190 Never played games 214 137 87 Give the conditional distribution of the grades of those who have played games. (Enter your answers rounded to two decimal places.)
General
2 months ago
A random sample of eighty-five students in Chicago city high schools takes a course designed to improve SAT scores. Based on these students, a 90% confidence interval for the mean improvement in SAT scores from this course for all Chicago city high school students is computed as (72.3, 91.4) points. The correct interpretation of this interval is__________.A. that 90% of the students in the sample had their scores improve by between 72.3 and 91.4 points.B. that 90% of the students in the population should have their scores improve by between 72.3 and 91.4 points.C. Neither choice is correct.
General
2 months ago
prism M and pyramid n have the same base area and the same height. cylinder p and prism Q have the same height and the same base perimeter. cone z has the same base area as cylinder y but its height is 3 times the height of cylinder y the figures_ and _ have the same volume
General
2 months ago
A vendor sells h hot dogs and s sodas. If a hot dog costs twice as much as a soda, and if the vendor takes in a total of d dollars, how many cents does a soda cost?
General
2 months ago
In triangle FGH, if the measure of angle G is five less than twice the measure of angle F and the measure of angle H is eighteen less than four times the measure of angle F, find the measure of angle G.
General
2 months ago
This composite figure is made of two identical pyramids attached at their bases. Each pyramid has a height of 2 units.2 identical pyramids with rectangular bases are connected at their base. The height of the pyramid is 2. The lengths of the sides of the rectangle are 5 and 0.25 units.
General
2 months ago
Eduardo, Sarah, Maria, Jim, and Tyrone have all been invited to a dinner party. They arrive randomly and each person arrives at a different time.a. In how many ways can they arrive? b. In how many ways can Eduardo arrive first and Tyrone last?c. Find the probability that Eduardo will arrive first and Tyrone last.
General
2 months ago
Suppose you and a friend each choose at random an integer between 1 and 8, inclusive. For example, some possibilities are (3,7), (7,3), (4,4), (8,1), where your number is written first and your friend’s number second. Find the following probabilities.a. p(you pick 5 and your friend picks 8)b. p(sum of the two numbers picked is < 4)c. p(both numbers match)
General
2 months ago
The equation below shows the total volume (V), in cubic units, of 4 identical boxes with each side equal to s units: V = 4s3 If s = 2.5 units, what is the value of V? (5 points) 25 cubic units 30 cubic units 62.50 cubic units 156.25 cubic unitsPlz help
General
2 months ago
In the previous problem, Ken predicted a drop in temperature. Explain why a drop in temperature would lead to adding a negative integer.
General
2 months ago
Find two numbers, if their sum is 6 and their difference is 36
General
2 months ago
There are 20 goldfish in a pond. Their population is increasing by 20% each year. The same pond has 100 minnows. The minnow population is increasing by 10 minnows each year. Make a graph to find the year that the two species of fish will have the same population. In what year will the fish populations be approximately the same?
General
2 months ago
Place the indicated product in the proper location on the grid.(3a + 2c )(9a 2 - 6ac + 4c 2 )
General
2 months ago
Place the indicated product in the proper location on the grid.(5c +2/3 )(5c -2/3 )
General
2 months ago
Keller boat travels 24mph. find the rate of the river if she can travel 6 mi upstream. in the same amount of time she can go 10 mi downstream.
General
2 months ago
DeAndre has two glass cylinders whose dimensions are shown in the diagram. He wants to determine which cylinder will hold the most water. Which of the formulas will help him determine which cylinder could hold the most water? A) V = 2πrh B) V =πr2h C) V = 4 3 π3 D) V = 1 2 πrh
General
2 months ago
the function f(x)=2^x and g(x)=f(x)+k. if k=2, what can be concluded about the graph?the graph of g(x) is shifted vertically...2 units to the left of the graph of f(x)...
General
2 months ago
PLEASE HELP! The manager of a sawmill wants to find out what percentage of the boards that the mill produced are defective.Which sampling methods are likely to be biased?Select each correct answer.The manager selects 20 boards at random each day for 5 days and examines them.Every 40th board produced over the course of 1 week is selected and examined.On 1 day, an hour after the sawmill begins production, 30 boards in a row are selected and examined.The manager sends an email to 20 customers who buy lumber from the mill, asking each how many of the boards they bought the past week were defective. Results from the first 5 customers to respond are tallied
General
2 months ago
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