Ghost of Speciation Past. In the article, “Ghost of Speciation Past” (Nature, Vol. 435, pp. 29–31), T. Kocher looked at the origins of a diverse flock of cichlid fishes in the lakes of southeast Africa. Suppose that you wanted to select a sample from the hundreds of species of cichlid fishes that live in the lakes of southeast Africa. If you took a simple random sample from the species of each lake and combined all the simple random samples into one sample, which type of sampling design would you have used? Explain your answer.

Q: ]Consider the following results of having collected a stratified sample (based on income I) of a…

A: The given information is: Mode Low 1 Medium 1 High 1 Car 3.33 18.00 20.00…

Q: 4. Independent random samples were selected from each of two normally distributed populations, n1 =…

A: given that in question n1=6 and n2= 4   Sample 1 Sample 2 3.1 2.3 4.3 1.4 1.2 3.7 1.7 8.9…

Q: n randomized, double-blind clinical trials of a new vaccine, infants were randomly divided into two…

A: Here the testing rule to be used is a two sample proportion z-test.   x1=129      n1=674x2=86…

Q: 4. Independent random samples were selected from each of two normally distributed populations, n1 =…

A: Given data, Sample 1 Sample 2 3.1 2.3 4.3 1.4 1.2 3.7 1.7 8.9 0.6…

Q: An experiment in teaching research methods in psychology was recently conducted at a large…

A: The null hypothesis isH0:The mean final exam scores for the three teaching methods are not…

Q: An experiment in teaching research methods in psychology was recently conducted at a large…

A: State the hypotheses.

Q: Suppose a simple random sample of size n= 200 is obtained from a population whose size is N=20,000…

A: a) Consider that p is the population proportion and p̂ is the sample proportion, where n is size of…

Q: What is the difference between selecting a member at random from a finite population and taking a…

A: A simple random sample is a random sample selected by a method in which all possible samples, of a…

Q: QUESTION 6 "A researcher is interested in knowing whether fans of ""The Office"" watch more Netflix…

A: Hypothesis test are used to compare sample and the population. Hypothesis test are of two types,…

Q: What method did Dr. Freud use to select his sample

A: Stratified sampling is used when the population is heterogeneous and is divided into number of…

Q: In a survey of 180 females who recently completed high school, 80% were enrolled in college. In a…

A: Solution: a. Let p1 be the proportion of college enrolees in group of females and p2 be the…

Q: QUESTION 6 "A researcher is interested in knowing whether fans of "The Office" watch more Netflix…

A: Given that,  A researcher is interested in knowing wheather fans of "The office" Watch more Netflix…

Q: A student claims that statistics students at her school spend, on average, an hour doing statistics…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: John Jones a statistician for the US Census Bureau. He has been assigned the task of determining…

A: State the hypotheses.   From the information, given that the study is test whether the proportion of…

Q: In a 4-week study about the effectiveness of Do you Feel Better? using magnetic insoles to treat…

A: n1 = 52, x1 = 15, p1 = 0.288 n2 = 48, x2 = 18, p2 = 0.375

Q: Question 3.  Two samples of sizes 15 and 16 are drawn from two normally distributed populations…

A: 3. The claim of the test is that first sample has a significantly lower variance than the second…

Q: ohn Jones a statistician for the US Census Bureau. He has been assigned the task of determining…

A: Solution: Let pC  represents the true population  proportion of female births in California.  pN…

Q: In an agricultural experiment, 20 small plots of land were randomly assigned to two varieties of…

A: There are two independent samples which are variety A and variety B. We have to test whether the…

Q: Sigmund Freud is interested in studying the dreams of adolescent boys (aged 10-19) to further his…

A: Simple random sample: A procedure for selecting a sample of size n out of a finite population of…

Q: in a simple random sample of size 75, there were 19 individuals in the category of interest. It is…

A: From the provided information, Sample size (n) = 75 From which 19 individuals in the category of…

Q: In a survey of 175 females who recently completed high school, 76% were enrolled in college. In a…

A: Given that: Significance level  = 0.07 The test is two tailed.

Q: A sunscreen company is attempting to improve upon their formula so that it lasts in water longer.…

A: State the hypotheses:  H0:μA=μB=μC=μD  HA: At least one mean is different. (claim) The level of…

Q: Independent random samples were selected from each of two normally distributed populations, n1 = 6…

A: Given that Sample 1 3.1 4.3 1.2 1.7 0.6 3.4 Sample 2 2.3 1.4 3.7 8.9 n1=6 n2=4   The two tailed…

Q: 8) The Discovery Automobile Company is attempting to determine if it should retain a previously…

A: Given,  Sample size = 500  Hypothesis :  H0 : p ≥0.5 H1 : p < 0.5 Left tailed test.…

Q: A biologist wishes to study the effect of the number of pollinating insects on yields of dates on a…

A: (Since it has been not mentioned which question so, as per our protocol we shall only answer the…

Q: A school superintendent wants to know the effects of a four week anti-bullying course on high school…

A:

Q: Random samples that are drawn independently from two normally distributed populations yielded the…

A: From the hypotheses can be constructed as: Null hypothesis H0: σ12 = σ22  Alternative hypothesis H1:…

Q: When testing (at the 5% level of significance) whether the vehicle-ownership distribution in this…

A: Test is that whether the vehicle-ownership distribution in this community differs from that of the…

Q: put a new type of tire with a special tread on a random sample of 50 cars, and the regular type of…

A: a). In the observational study, the assignment of treatment groups is not made by the researcher.…

Q: In a survey of 200   females who recently completed high​ school, 75 ​% were enrolled in college.…

A: Answer:-

Q: How many simple random samples of size 3 can be selected from a population of size 7? а. 35 b. 210…

A: Answer - How many simple random sample of size 3 can  be selected from a population of size 7 ?

Q: Example 7: A Production manager at a tyre manufacturing plant has inspected the number of defective…

A: Answer: For the given data

Q: Suppose a simple random sample of size n=125 is obtained from a population whose size is N=10,000…

A:

Q: Page 445 #6b An experiment in which the three mutually exclusive events A, B, and C form a…

A: In this context, the aim is to obtain the value of PB|Dc: The conditional probability formula is…

Q: Many elementary school students in a school district currently have ear infections. A random sample…

A:

Q: True or false: a) A simple random sample is guaranteed to reflect exactly the population from which…

A: Random sample: Random sample is one in which every unit in the whole population has an equal chance…

Q: In a flowering plant species, snapdragons, variation in flower color is determined by a single gene.…

A: Given that: The first cross experiment ends up with 40 offspring's, including 10 red, 21 pink, and 9…

Q: QUESTION 2 Private sector managing directors are of the opinion that 50% of the corporate,…

A: Given : Claim : The proportion of executives that rate cash flow as the most important indicator of…

Q: Consider an environmentalist examines two forests, forest A and forest B. The proportion of maple…

A: Given: n1=35n2=35p^1=0.38p^2=0.24

Q: Mars, Inc. states that 16% of all milk chocolate M&M’S® produced are green. A group of students took…

A: Sample survey

Q: 4. Independent random samples were selected from each of two normally distributed populations, n1 =…

A: Suppose we want to test whether two independent samples xi, (i=1,2,...,n1) and yj, (j=1,2,...,n2)…

Q: 1.110 Late Night Eating It is well-known that lack of sleep impairs concentration and alertness, and…

A: Answer :

Q: In the article “The Eastern Cottonmouth (Agkistrodon piscivorus) at the Northern Edge of Its Range”…

A: Given information Sample size n = 44 Sample mean x̅ = 7.6 Population standard deviation σ = 2.4

Q: Question 26 The population proportion of individuals in the United states who are aged 18+ have…

A: Z test

Q: An experiment in teaching research methods in psychology was recently conducted at a large…

A: State the hypotheses.

Q: Question 12 In a single-factor ANOVA problem involving five populations or treatments with a random…

A: Given : SSTr = 16.1408  SSE = 37.3801 n = 5*4 = 20 k = 5

Q: In an effort to better manage his inventory levels, the owner of two steak and seafood restaurants,…

A: Given Information : In an effort to better manage his inventory levels, the owner of two steak and…

Q: How do the average weekly incomes of electricians and carpenters compare? A random sample of 17…

A: First We need to check whether variances are equal or not, To check the run an F test…

Q: 1. A textbook company is conducting research to evaluate the effectiveness of their new curriculum…

A: Given information: x1 = 634 x2 = 561 n1 = 1008 n2 = 825 p^1=x1n1=6341008=0.6290p^2=x2n2=561825=0.68…

Q: A sunscreen company is attempting to improve upon their formula so that it lasts in water longer.…

A: Consider that, µA, µB, µC and µD define the mean lifespan of sunscreen A, B, C, and D, respectively.

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.