4. A sample of male and female students were equipped with a device that records sound for one day. Data about number of words spoken per day are presented below: Males Females Mean 16177 16569 Standard 7520 9108 Deviation Construct a 99% confidence interval for the difference in the mean number of words spoken by males and females. Using this confidence interval, can you support the claim that females talk more than males? Assume the population variances to be unknown and unequal.

Q: How do you calculate the sample variance for proportions when the sample is drawn from a dichotomous…

A:

Q: What sampling method was used?

A: 100 students was required to estimate the mean achievement in research of graduatestudents. The…

Q: or the population of 31 companies surveyed, with an average size of 1,414 workers? What type of…

A: Given  Average size = 1414 Companies = 31 The total population will be = 31*1414 =43834

Q: When the sample size is 15 and you are doing a t test, the number of degrees of freedom is 15. True…

A: Given that  Sample size n =15 Degree of freedom =df =n-1

Q: Which factors are responsible for the size of a sample?

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Q: Explain in your own words the advantages of bigger random samples in a sample survey

A: Explain in your own words the advantages of bigger random samples in a sample survey

Q: How do the Boundaries for the observed sample, Common and Rare Outcomes?

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Q: To study about the introduction of schools. The strength of the schools are 2000, 2500 and 4000. It…

A:

Q: isn't the sample size should be 35, not 12?

A: We have given that the information presented by the tutorial school related to the IELTS  mock…

Q: What is the formula to be used to determine the total possible random samples?

A: Let the population size be N Sample size be n

Q: Among the random and non-random sampling techniques that we have, which do you think is the most…

A: Random/Probability sampling is a technique in which each member of the population has an equal and…

Q: Mother smoking Infant colic Yes No Total status Yes 15 167 182 No 111 2477 2588 Total 126 2644 2770

A: The given data is as follows:Mother smoking statusInfant…

Q: how to calculate sampling weight

A: Sampling is a part of our day-to-day life which we use advertantly or inadvertantly . For instance a…

Q: The sample size is 40, why not use the " one mean z-test?

A: Sample size n=40 Sum of observations ∑x=1200 The sum of the square of observations ∑x2 85000…

Q: Describe about the types of sampling.

A: In simple random sampling, each of the unit is population has equal chance of being selected in the…

Q: A balance used in an entomology lab to weigh grasshoppers is quite old and has been used for…

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Q: Write a short note on the importance of random sample.

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Q: ethod? Select all that apply

A: Sampling Methods: The sampling methods are classified into 2 types  Random Sampling or…

Q: Describe the large sample test procedure to test the equality of two proportions.

A: FOR LARGE SAMPLE SIZE WE SHOULD USE Z TEST AND DETAILED PROCEDURE IS GIVEN IN THE SECOND STEP.

Q: In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests."…

A: Given information: Sample of 200 buses and find that 20 buses fail the safety inspection. Let us…

Q: Describe about the All Possible Random Samples.

A: The random samples can be selected in the following methods: Simple random sampling: If a sample of…

Q: Describe about the Tables of random numbers can be used to obtain a random sample.

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Q: Explain how a sampling distribution of a sample can be constructed.

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Q: In order to cut the margin error in half, what must we do? Group of answer choices Multiply the…

A: The margin of error is inversely proportional to the square root of the sample size. So, if you want…

Q: how do you find the simple random sample of 15 restaurants?

A: In simple random sampling each member of the population has an equal chance of being included in the…

Q: If the sample size is increased, the margin of error will decrease.   True or False

A: Given statement : " If the sample size is increased, the margin of error will decrease "

Q: Is the sample size of survey is multiplied by 100, then by what factor is the margin of error…

A: Solution

Q: A university has 30,000 undergraduate and 10,000 graduate students. A survey of student opinion…

A:

Q: How do a paired-sample design and an independent-sample design differ?

A: A paired-sample design and an independent-sample design are two different types of research designs…

Q: A population consist of numbers 3,6,9,12, and 20 and the sample size n=3 (apply the 8 steps ,upload…

A: Population Numbers are 3 6 9 12 20 From the given population samples are prepared with size 3…

Q: Determine the sampling methods used in each of the scenarios below iv. Select 8 white cars, 5 blue…

A: Stratified sampling: It is a sampling method in which the entire population is divided into…

Q: Why a casual or haphazard sample doesn’t qualify as a random sample?

A: Haphazard or casual sampling is where we try to create a random sample by haphazardly or casually…

Q: An electronics manufacturer test every 300th cell phone to verify that it is functioning properly.…

A: It is an important part of statistics . It is widely used.

Q: What is the Importance of Equal Sample Sizes?

A: The t-test and ANOVA assume that the sample sizes are equal. There is an importance that the two…

Q: What are the practical Reasons for learning how to use the formula in determining sample size?

A: The two major factors affecting the power of a study are the sample size and the effect size A…