math

A study of 60 bolts of carpet showed that their average length was 180 yards. The standard deviation of the population is 6 yards. Which of the following is the 99% confidence interval for the mean length per bolt of carpet?

  1. 👍 0
  2. 👎 0
  3. 👁 189
  1. No alternatives given. Cannot copy and paste here.

    99% = mean ± 2.575 SEm

    SEm = SD/√n

    You do the math.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Statistics

    Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective .(you may take the distribution to be Poisson; e-4= 0.0183).

  2. math

    A factory finds out that on the average 20% of bolts produced by the given machine will be defective.if 10 bolts are selected at random from the day's production of this machine,find the probability that 1.exactly 2 will be

  3. stastics

    If 1.5% of the bolts made by an automotive factory are defective, what is the probability that in a shipment of 200 bolts, there are 6 defective bolts? Place your answer, rounded to four decimal places, in the blank.

  4. Math Check my Answers please ?

    1.)if an object is dropped from a height of 144 ft the function h(t)=-16t^2+144 gives the height of the object after t seconds. when will the object hit the ground? a.)1.5 seconds b.)3 seconds *** c.) 6 seconds d.)9 seconds 2.)

  1. Algebra

    A rectangular Persian carpet has a perimeter of 212 inches. The length of the carpet is 24 inches more than the width. What are the dimensions of the carpet?

  2. Statistics

    A study of 40 bowlers showed that their average score was 186. The standard deviation of the population is 6. Find the 95% confidence of the mean score for all bowlers.

  3. math

    the family room in your house is 6 1/2 yards long and 5 3/4 yard wide. carpet cost $16 per square yards. how much will it cost to buy carpet for the family room?

  4. Math-Statistics

    If 5% of the bolts made by an automotive factory are defective , what is the probability that in a shipment of 200 bolts, there are 15 defective bolts? Use the binomial probability formula n=200 and p = 0.05 a. 0.081 b. 0.034 c.

  1. Math

    Carpet plus installs carpet for $100 plus $8 per square yard of carpet. Carpet World charges $75 for installation and $10 per square yard of carpet. Find the number of square yards of carpet for which the cost including carpet and

  2. Math

    Sarah wants to install new carpet in her living room. The small square is titles 2yd by 2yd and will not be carpeted. How many square yards of carpet will she need if its 6yd by 4yd? ---------------6yd---------------| |. | |. I

  3. Geometry

    4. Plots of land between two roads are laid out according to the boundaries shown. The boundaries between the two roads are parallel. What is the length of Plot 3 along Cheshire Road? 46 yards 67 yards 66 yards 37 yards

  4. Math

    A rectangular compound has the dimensions 6m by 10m A square carpet is laid in the centre of the compound. the carpet is 3m by 3m. Find the part of the compound that is uncovered by the carpet.

You can view more similar questions or ask a new question.