Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 43 minutes and standard deviation 17 minutes. A researcher observed 47 students who entered the library to study. Round all answers to 4 decimal places where possible. The top 10% of the total study time for groups of 47 students will be given a sticker that says "Great dedication". What is the least total time that a group can study and still receive a sticker? minutes

Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…

A: From the given information we have The null and alternative hypothesis are H0 : µ = 132H1: µ >…

Q: The mean score on a set of 25 tests is 76. What is the sum of all the test​ scores?

A: The mean (aka the arithmetic mean, different from the geometric mean) of a dataset is the sum of all…

Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

Q: A college counselor wants to determine if the number of hours spent studying for a test can be used…

A: An explanatory variable is the one which can be changed independently or what you manipulate or…

Q: What scale of measurement is being used when a teacher measures the number of correct answers on a…

A:

Q: A set of observations has 4 values and a mean of 33.6. A new observation of 21.3 is added to the…

A:

Q: Two different surveys will be conducted to estimate the mean salary of employees who have taken a…

A: The confidence interval inversely depends on the sample size. The formula for the confidence…

Q: Suppose that 10 students have taken an exam and that the mean and median scores are both 60. (Since…

A:

Q: The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the…

A: The cumulative frequencies are obtained in the below table:

Q: The mean is approximately (Round to the nearest whole number as needed.)

A: It is given that  n1 = 7 X̄1 = 240 n2 = 4 X̄2 = 190

Q: Of the 200 American film enthusiasts, the average age is: 30 years, while the standard deviation is…

A: Normal distribution is generally denser in the center, and basically less denser at the tails. There…

Q: Tell me whatever you can about the following table using the chi-square test for association…

A: The data table shows the writing hands of the adults.

Q: What length of nails is considered to be at the 58th percentile of all nails?

A:

Q: The U.S. Department of Transportation reports that in 2018 about one of every 352 passengers on…

A: To calculate the UCL (Upper Control Limit), we need to use the formula: UCL = p + 3√((p(1-p))/n)…

Q: cognitive psychologist has recently developed a test to measure the emotional intelligence of…

A: Given,mean(μ)=95standard deviation(σ)=10

Q: Suppose there are 5 students in a room. The mean age is 20.0 years, and the median age is 19. If the…

A: From the provided information, There are 5 students in a room. The mean age is 20.0 Years. The…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: According to a college survey, 89% of all students work full time. Find the mean for the number of…

A: It is given that the number of observations are independent with the probability of success p = 89%…

Q: The mean earning of men in Florida differs significantly from the mean earning of men in Texas. If…

A: Sample sizesn1 is 123 and n2 is 88.

Q: A data set has five values. The 45th and the 55th percentile are both 25. The largest value is 125,…

A: We have to given that,   data set has 5 values i.e. n=5 and 45th percentile = 55th percentile = 25…

Q: If a set of numbers has a standard deviation of zero, what can you say about the numbers?

A: The standard deviation indicates that amount of deviation of data points from the mean.

Q: The mean score on a set of 17 tests is 85. Suppose two more students take the test and score 62 and…

A: we need to find new mean using given conditions

Q: The mean score on a set of 23 tests is 76. Suppose two more students take the test and score 70 and…

A: given data n = 23 had mean of 76 . two more students take test and score 70 and 65. new mean  = ?

Q: 5. Two different 5th grade classes take the same test. In the first class of 50 students the mean…

A: Given the First class Sample size =50  Mean =70  Second class  Sample size =20  Mean =90 We have to…

Q: Three cars are driving on a racetrack. The mean speed of the three cars is 100 miles per hour.  Car…

A:

Q: Use your favorite search engine to find 10 daytime high temperatures from where you live. After…

A:

Q: Ten students take a 10-point test. The mean score is 8. Could the median be 10? Could the median be…

A: Solution-: Ten students take a 10-point test. The mean score is 8. Could the median be 10? Could the…

Q: The distances golf balls travel under laboratory testing conditions are normally distributed. The…

A:

Q: If the mean of a data set is 22 and the SD is 5, what % of the values fall between 12 and 27? Give a…

A: given that  mean of a data set is 22

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.