Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 47 minutes and standard deviation 20 minutes. A researcher observed 40 students who entered the library to study. Round all answers to 4 decimal places where possible. Find the probability that the randomly selected 40 students will have a total study time more than 1800 minutes. _____ The top 20% of the total study time for groups of 40 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: In a series of 5 observations, the values of mean and variance are 4.4 and 8.24. If three…

A: It is given that the mean and standard deviation are 4.4 and 8.24.

Q: Suppose that you want to determine the number of people who will attend a conference this year. In…

A: Given information: The investigator wants to determine the umber of people who will attend a…

Q: During a wisdom teeth removal procedure, 1, 2, 3, or 4 wisdom teeth are removed, depending on the…

A:

Q: In a series of 5 observations, the values of mean and variance are 4.4 and 8.24. If three…

A:

Q: Section 1. IQ tests supposedly measure our intelligence. They typically are 'normed' so that they…

A: We have given that  Mean = 100 Standard deviation = 15

Q: The National Sleep Foundation surveyed representative samples of adults in six different countries…

A: we have given that  n1=250 ,n2=250 ,xbar1=391 ,xbar2=426 ,s1=20 ,s2=44 alpha=0.05

Q: The average American gets a haircut every 39 days. Do college students get their hair cut less…

A: A hypothesis test is a statistical  method that uses sample data to evaluate a hypothesis  about a…

Q: Suppose that the speeds of cars travelling on California freeways are normally distributed with a…

A: Provided information is: The speeds of cars travelling on California freeways are normally…

Q: If in a data set the observation 78 has z-score equal -0.60 and the observation 88 has z- score…

A:

Q: population has a mean of 350 and a standard deviation of 25, determine the probability that a random…

A: GIVEN DATA, μ=350σ=25n=40p(335<x¯<375)=?

Q: Assume that 26% of students at a university wear glasses. Suppose 300 students are randomly…

A:

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: Suppose that the distribution of the scores of students in Statistics Assignment 1 is roughly…

A: GivenMean(μ)=85standard deviation(σ)=5sample size(n)=16

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: Yoonie is a personnel manager in a large corporation. Each month she must review 10 of the…

A: Given Data: μ=4σ=0.9n=10

Q: About 2% of the population has a particular genetic mutation. Suppose 100 people are randomly…

A: Givenp=2%=0.02n=100x~Binomial(n=100,p=0.02)P(X=x)=(nx)(p)x(1-P)n-x  ; x=0,1,2...,n

Q: he scores on a psychology examination are normally distributed with a mean of 70 and a standard…

A: Solution:  Let X be the scores on psychology examination are normally distributed with mean of μ= 70…

Q: 3. The amount dispensed by the coffee machine follow the normal distribution with a mean of 5,286…

A:

Q: Sketch the distribution, show the mean and standard error, and shade the part of the curve…

A: It is given that, n = 200 and p = 0.34.

Q: The data {9, 5, 5, 9, 2} represent a random sample of the number of days absent from school for five…

A:

Q: 2000 freshmen at state university took a biology test. the scores were normally distributed with a…

A: Solution: Let X be the scores. From the given information, X follows normal distribution with mean…

Q: Guiz. 17 pis possi About 75% of all female heart transplant patients will survive for at least 3…

A:

Q: Suppose that the amount of time that students spend studying in the library in one sitting is…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: The time spent waiting in the line is approximately normally distributed. The mean waiting time is 5…

A: given data,normal distribution μ=5σ=3probability that person will wait more than 9 minutes =?

Q: Yoonie is a personnel manager in a large corporation. Each month she must review 10 of the…

A: a) Define a random variable X, that is the time to review.

Q: Below are the times ( in days) it takes for a sample of 6 customers from Ivan's computer store to…

A: Answer:- Given sample is, 21, 29, 36, 28, 40, 32Using formula,

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A:

Q: During a wisdom teeth removal procedure, 1, 2, 3, or 4 wisdom teeth are removed, depending on the…

A: We have to find mean and sd.

Q: Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have…

A:

Q: A professor gives a test to her calculus students. The scores are approximately normally distributed…

A: The normal distribution is the most useful theoretical distribution for continuous variables.…

Q: Suppose that the speeds of cars travelling on California freeways are normally distributed with a…

A: Given Information: The speeds of cars travelling on California freeways are normally distributed…

Q: Find the are of the shaded region. The graph depicts the iq scores of adults and those normally…

A:

Q: Yoonie is a personnel manager in a large corporation. Each month she must review 16 of the…

A: Solution Give  Χ be the random variable representing the time it takes her to complete one review…

Q: Entry to a certain University is determined by a national test. The scores on this test are normally…

A:

Q: be the random variable representing the mean time to complete the  10  reviews. Assume that the  10…

A:

Q: Sketch the distribution, show the mean and standard error, and shade the part of the curve…

A: Given: p=0.34 n=1000

Q: calculate the standard deviation of the data shown, 27.7, 10.8, 10.6, 21.1,22.1. round to 2 decimal…

A: Given: Sample data is 27.7, 10.8, 10.6, 21.1, and 22.1.

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.