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A bank wonders whether omitting the annual credit card fee for customers who charge at least $2500 in a year will increase the amount charged on its credit cards. The bank makes this offer to an SRS of 200 of its credit card customers. It then compares how much these customers charge this year with the amount that they charged last year. The mean increase in the sample is $346, and the standard deviation is $112. The distribution of the amount charged is skewed to the right, but outliners are prevented by the credit limit that the bank enforces on each card.
Can we use a confidence interval based on a Normal sampling distribution for the sample mean x-bar?
A confidence interval can be used because the sample is large and there are no outliners.
A confidence interval cannot be used because the distribution of the amount charged is skewed.
A confidence interval cannot be used because the sample is small.
find the perimeter of one of the smaller rectangles using systems of equations.
three wheels wrapped tightly together with a belt, each wheel has a radius of 10 cm. What is the length of the belt to the nearest mm?
A shipment of 120 computer cases that contains 5 defective cases was sent to an assembly plant. The quality control manager at the assembly plant randomly selects 5 cases and inspects them. What is the probability exactly one case is defective?
Probability: Working with the standard distribution curve. A company installs 5000 light bulbs, each with an average life of 500 hours and a standard deviation of 100 hours, and a distribution approximated by a normal curve
You invested $19000 in two accounts paying 7% and 8% annual ineterest respectively. If the total interest earned for the year was $1350, how much was invested at each rate?
Determine the probability distribution's missing value. The probability that a tutor will see 0, 1, 2, 3, or 4 students x=px,0=4/27,1=1/27, 2=5/9, 3=?, 4=5/2
use the product rule and these figures to estimate the rate at which total personal income was rising in the richmond-petersburg area in 1999. explain the meaning of each term in the product rule.
Service station cars arive randomly at a rate of 1 car every 30 min. the average time to change oil on a car is 20 min. both the time between arrivals and service time can be modeled using the negative exponential Poisson distribution.
Given that the acceleration vector is a(t) = (-9cos(-3t)) i + (-9sin(-3t)) j + (-2t) k , the initial velocity is v(0) = i + k , and the initial position vector is r(0) = i+j+k , compute:
A surveyor measures the top of a building. The top of the building is 50 ft away from his angle-measuring device. His angle-measuring device is 4 ft above ground. The angle of elevation to the top of the building is 63 degrees. How tall is the bui..
Peak Elevation. The tallest mountain in the world, as measured from the base to the peak, is Mauna Kea in Hawii. From a base 19,684 ft. below sea level, it rises 33,480 ft. What is the elevation of its peak?
the area of each base id 64 square inches. Find the lenth of the lateral edge of the prism
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