A research company wants to estimate the mean IQ score for the population of all high school students.  If the population standard deviation is 30,what is the minimum number of high school students should be selected for IQ tests if  the company wants 95% confidence that the sample mean will be within 3 IQ points of  the population mean?

Q: A food critic wishes to estimate the weights of premium steaks at a five star Texas style…

A: From the provided information, Confidence level = 90% Margin of error (E) = 6 ounces Standard…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: 1): at given raw score (X=151)      Z score=(X-mu)/sd=-0.8  # mu(population mean)=175  # sd(standard…

Q: If IQ scores are normally distributed with a mean of 100 and standard deviation of 12, what does…

A: The normal distribution is symmetric in nature having parameters μ and σ.The mean, mode, and median…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: The Z-score can be calculated as: Where, x = raw value µ = mean σ = standard deviation

Q: A recent poll found that 59% of adults believe the state of moral values is poor. For 400 randomly…

A: Here, n = 400 and p = 0.59

Q: For an educational study, a volunteer must place in the middle 50% on a test. If the mean for the…

A:

Q: Raul received a score of 77 on a history test for which the class mean was 70 with a standard…

A: for history test:mean(μh)=70standard deviation(σh)=4and xh=77For biology test:mean(μb)=70standard…

Q: On a standardized examination, Laura received a score of 83, which was exactly 2 standard deviations…

A:

Q: Loretta, who turns  91  this year, has heard that the mean systolic blood pressure among the elderly…

A: State the hypotheses. That is, there is no evidence that the mean systolic blood pressure among…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Given that, Mean = 130 Standard deviation = 20 Raw score = 156

Q: A market researcher, Codie, wants to find a 97% confidence interval for the mean number of dollars…

A:

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: The hypothesis for the claim 'mean systolic blood pressure among elderly adults is greater than 120…

Q: The results of a common standardized test used in psychology research is designed so that the…

A:

Q: Contrary to popular opinion, a psychologist claims that the mean IQ score of math instructors is…

A: The provided information is  n=25x¯=120σ=30µ=100 here the parameters are known then we use…

Q: An advertising executive wants to estimate the mean amount of time that consumers spend with digital…

A: Here we've given the following values. Standard deviation , σ = 43 minutes. Margin of error , E = ±…

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: The random variable systolic blood pressure is normally distributed. The population mean is 120. The…

Q: The results of a common standardized test used in psychology research is designed so that the…

A:

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: Givensample sie(n)=18sample mean(x¯)=128standard deviation(s)=22α=0.05

Q: A psychologist believes that it will take at least an hour for certain disturbed children to learn a…

A:

Q: A marketing researcher wants to find 95% confidence interval for the mean amount that visitors to a…

A: Given Data: The confidence interval is: CI=95% The standard deviation is: σ=11 The mean of the…

Q: A large number of applicants for admission to graduate for study in businesss are given an aptitude…

A: Let X denote the aptitude test scores and it follows normal distribution with mean of μ=400 and…

Q: Students at Roseville High School took an IQ test with a mean of 100 and a standard deviation of 15.…

A: GivenMean(μ)=100standard deviation(σ)=15

Q: Miss Romero noted that the mean scores of a random samples of 15 Grade- 8 students who had taken a…

A: Given,   Sample mean x¯ = 80.5standard deviation σ = 3Sample size n = 8

Q: . A biologist is interested in studying the effect of vitamin supplements on deer mouse body length.…

A:

Q: A psychologist has developed a new test of spatial perception and she wants to estimate the mean…

A:

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Given: μ=105σ=20 The z-score for the raw score 99 is obtained as below: z=x-μσ=99-10520=-620=-0.3…

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Given,standard deviation(σ)=8margin of error(E)=2α=1-0.94=0.06α2=0.03Z0.03=1.8808       (from…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Given Data: x¯=160σ=30   x=127

Q: A researcher is looking to estimate the mean LSAT score of law school applicants who completed their…

A: From the provided information, Margin of error (E) = 2 points Level of confidence = 99% Standard…

Q: The mean of small dogs is 4.1 and the standard deviation is .9, what is the probability of choosing…

A: The weight of the small dogs is the continuous data.Let X be the weights of the small dogs which…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Formula for z-score is,

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: As per bartby gaidline excite have to ans fast three subpart part only dear student please upload…

Q: The population standard deviation for the heights of dogs, in inches, in a city is 5.7 inches. If we…

A:

Q: The results of a common standardized test used in psychology research is designed so that the…

A:

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A:

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Given Information: Population mean (u) = 165  Standard deviation (σ) = 10  Score earned by a subject…

Q: A nutritionist wants to estimate the mean amount of cholesterol in a certain variety of chicken…

A: Given Data: Level of significance=0.01  σ=25mg ME=10   To Find: 'n'

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Let, X=the results of a common standardized test X follows a normal distribution with mean=140 and…

Q: A university dean wishes to estimate the average number of hours that freshmen study each week. The…

A:

Q: if an average score of exams was 74 points for 24 students  the 25th student got 64 points whats…

A:

Q: ) In order to set rates, an insurance company is trying to estimate the number of sick days that…

A: It is given that confidence level is 0.95, population standard deviation is 2.2 and margin of error…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: From the provided information, Mean (µ) = 175 Standard deviation (σ) = 10 X~N (175, 10) Here X be a…

Q: A researcher wants to estimate the mean serum cholesterol level for college age women.  In a past…

A: Solution: From the given information, confidence level is 0.99, σ=42 and E=3.

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Given Data: ME=4/2=2 σ=8   z-value corresponding to 97% of CI=2.17

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A:

Q: The distribution of scores on the SAT is approximately normal with a mean of µ = 500 and a standard…

A:

Q: A university dean wishes to estimate the average number of hours that freshmen study each week. The…

A: It is given that confidence level is 0.99, standard deviation is 2.6 and margin of error E is 0.5.

Q: You are interested in estimating the mean weight of the local adult population of female…

A: It was stated that I am interested in estimating the mean weight of the local adult population of…

Q: The results of a common standardized test used in psychology research is designed so that the…

A:

Q: What sample size is needed if the agency wants to be 99% confident of being correct to within ±5…

A: Here given An advertising agency that serves a major radio station wants to estimate the mean amount…

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.