Sketch the distribution, show the mean and standard error, and shade the part of the curve corresponding to your calculation. Suppose that at a large university,  34% of the students decide to take their classes online. 1. If a university researcher takes a sample of 200 students, what is the probability that less than 30% of the sample will decide to take classes online?

Q: 6. The size of fish is very important to commercial fishing. A study conducted in 2012 found the…

A: From the provided information, Mean (µ) = 42.1 cm Standard deviation (σ) = 2.98 cm X~N (42.1, 2.98)…

Q: The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation…

A: (a)   Obtain the probability that pregnancy will last 307 days or longer. The probability that…

Q: The proportion of all high school students who watch national news is p = 0.47. A random sample of…

A: Given n = 50 p = 0.47 Therefore,  np = 50×0.47 = 23.5 n(1-p) = 50(1-0.47) = 50(0.53) = 26.5

Q: exam is 53.48 and the mean for that same exam is 44.23.  What would be the shape of the distribution…

A: For any Normal distribution, the shape of the distribution can be said if the mean, median and mode…

Q: According to the Department of Education, 60% of college students enjoy taking Statistics. Suppose…

A: Let  X be the number of students who enjoy taking Statistics in a sample of 200. Given n = 200…

Q: The distribution of the number of people in line at a grocery store has a mean of 3 and a variance…

A:

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

Q: For quantitative data, the mean is the best measure of center when the distribution is skewed.…

A: The statement is provided that mean is the best measure of center when the distribution is skewed.…

Q: Suppose multiple samples of size n  are drawn from a population with a probability of success equal…

A: Defined : probability of success equal to 57% p=0.57

Q: 2. Suppose that the mean lifetime of a random sample of 25 batteries produced by a factory is 700…

A: Solution: 2. Let X be the lifetime of a battery. From the given information, X follows normal…

Q: A statistician wants to know whether newborn baby boys or newborn baby girls cry more. Consider the…

A: Given that  I. The statistician randomly selects 100 sets of newborn baby twins that include a boy…

Q: A sample mean has a z= -4.0 on the sampling distribution created from the population of psychology…

A:

Q: 4. On a certain standardized test, the population mean is 250 with a standard error of the mean of…

A: Given: Population mean, μ=250Standard error of mean, σx¯=25

Q: you know 10% of the people in Amsterdam describe themselves as hipsters. you ask 400 respondents if…

A: Solution: Given data : p = 10% = 0.10 Sample size (n) = 400 To find: standard deviation of the…

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

A: The given situation follows binomial distribution. The proportion of people born in United States…

Q: The length of a fully grown hibiscus plants is normally distributed and has a mean of 35cm and a…

A: Given that,Mean(μ)=35standard deviation(σ)=4     The random variable  is length of fully grown…

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

A:

Q: at you wanted to figure out your average winnings during a trip to Las Vegas. You know that the…

A: We use z-interval or confidence interval by using the z -distribution if the value of population…

Q: You want to estimate the mean number of friends for all Facebook users. How many users must be in…

A: Given data :  95% CI Standard deviation = 53 E = 7

Q: For question #4, write your answer exactly as it appears. 4) It has been known that 18% of victims…

A:

Q: Q5. Explain the importance of statistics in the field of drug development and the pharmaceutical…

A: Statistics is a significant apparatus in pharmacological examination that is utilized to sum up…

Q: Approximately 6% of American drivers d not text while they drive. Suppose you are working with a…

A: The given situation fits binomial distribution as there are 300 independent trials (300 people),…

Q: In your two sets of Statistics tests, find the mean of the number of tests that will be passed. 1.…

A: Given: The provided dataset is given as: Number of passed test (x) Probability P(x) 0 0.25 1…

Q: According to a recent​ study, 80% of adults say they play games on their smartphone. Suppose we…

A: The provided data is, p = 0.80 n = 200 The mean and standard deviation of the population proportion…

Q: C. The test statistic |(please show your answer to 3 decimal places.) d. The p-value = (Please show…

A: Given n=12 Let X : Waiting time for men who wear a tie x 14 16 14 17 15 15 13 13…

Q: The middle 95% of a group of 1000 students got scores ranging from 50 to 90 on a math test. If the…

A: Normal Distribution: Understand the properties of the normal distribution, including the mean (μ)…

Q: IV. The table below shows the number of students who visit the library per day. X 30 45 52 55 60 16.…

A:

Q: The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances…

A:

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

A:

Q: 3. The average consumption of rice that a rural male adult person in a year is 70 kilos. If 25 rural…

A: Ans# Here X ~ N( μ, σ)          Where  μ = 70   and σ = 112,       sample size n = 25         Find…

Q: Suppose it is known that 37% of Camp Crystal Lake campers return the next summer. A random sample of…

A: Given: 37% of the campers return next summer. p=0.37 n=15

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.