Statistics question and answers for December 31, 2023
- Q The NIH is creating a test for the Flu virus The incidence of a Flu is low 2 percent in the general population There is a trial version but it...
- Q The NIH is creating a test for the Covid virus The incidence of a Covid is low 10 percent in the general population There is a trial version but it...
- Q A survey asks Which online services have you used in the last month Twitter Facebook Have used both The results show 33 of those surveyed have used Twitter 59 have...
- Q An urn contains 7 blue 5 yellow and 3 gray marbles Two marbles are randomly drawn from the urn Find the probability the two marbles are the same color O...
- Q The z value corresponding to a 0 80 cumulative probability was found to be 0 84 Thus the necessary return x will be 0 84 standard deviations above the mean...
- Q Suppose you roll a special 7 sided die What is the probability that the number rolled is a 1 OR a 2
- Q c Assume that the class has 80 students and that the examination period is 130 minutes in length How many students do you expect will be unable to complete the...
- Q The area under the curve to the left of z 2 was found to be 0 0228 and the area under the curve to the left of z 0 75...
- Q Calculate the standard deviation of the sample data shown to two decimal places X 14 3 27 7 28 8 24 3 18 8 11 2 7 6
- Q 89 Salaries for managers in a restaurant chain are normally distributed with a mean of 44 000 and a standard deviation of 6 500 We randomly survey 10 managers from...
- Q 84 Find the probability that the average price for 30 gas stations is less than 4 55 a 0 6554 b 0 3446 c 0 0142 d 0 9858 0...
- Q Using the standard normal z random variable the probability statement P 60 x 85 is now P 2 z 0 75 so the normal probability table can be used The...
- Q 85 Suppose in a local kindergarten through 12th grade K 12 school district 53 percent of the population favor a charter school for grades K through five A simple random...
- Q distributed uniformly from zero to 75 minutes One hundred riders are randomly sampled to learn how long they waited 81 The 90th percentile sample average wait time in minutes for...
- Q 45 of all Californians registered voters prefer life in prison without parole over the death penalty for a person convicted of first degree murder Among Latino California registered voters 57...
- Q Recall that the standard normal random variable z represents the number of standard deviations a value x is away from the mean The normal probability table gives area under the...
- Q c How big does the return have to be to put a domestic stock fund in the top 20 for the three year period Another way to think about this...
- Q Step 8 To find P 1 65 z 1 05 subtract the area to the left of z 1 65 from the area to the left of z 1 05...
- Q The desired probability is P 60 x 85 First convert this probability statement using the standard random variable z Recall the formula for this conversion below where x is the...
- Q The probability statement was determined to be P z 0 14 Recall that the normal probability table gives the area under the curve to the left of a given z...
- Q The correct size of a nickel is 21 21 millimeters Based on that the data can be summarized into the following table indicating the numbers of children from each income...
- Q A CBS News poll conducted June 10 and 11 2006 among a nationwide random sample of 651 adults asked those adults about their party affiliation Democrat Republican or none and...
- Q The correct size of a certain object is 21 21 millimeters Based on that the data can be summarized into the following table indicating the numbers of children from each...
- Q A recent study surveyed 1 341 households asking if the residents rented or owned and if the residents included dependents The results are summarized below 1 or More Dependent No...
- Q Phi Delta Kappa PDK is an international professional organization for educators that in collaboration with Gallup has been conducting polls on the public s attitudes toward the public schools since...
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