A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 33 points with 99 %99% confidence assuming s equals 19.7s=19.7 based on earlier​ studies? Suppose the doctor would be content with 95 %95% confidence. How does the decrease in confidence affect the sample size​ required?

Q: According to a study, a cup of coffee contains an average of 119 milligrams (mg) of caffeine, with…

A: Given that ME=7

Q: Samples of size 2 200- Samples of size 5 150- 100어 100- 50- 28 Sample Mean Waist Size 0- 30 Sample…

A: The central limit theorem (CLT) is to be interpreted to identify the underlying distribution of the…

Q: People are polled on how many books they read the previous year. Iniital survey results indicate…

A: Formula for the sample size needed to estimate a population mean is

Q: What is the residual sum of squares around the fit for a dataset with an r^2 of 1?   If the sum of…

A: We know  R2=Explained sum of squaresTotal sum of squares⇒1=Explained sum of squaresTotal sum of…

Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A: The random variable HDL cholesterol follows normal distribution. The margin of error is 3. The value…

Q: A sample of 94 women aged 18-24 yields a mean systolic blood pressure of 114.1 mm Hg. Assuming that…

A: we have given data, A sample of women (n)= 94 and mean (mu)= 114.1 standard deviation (sigma)= 13.4…

Q: Q3ii In measuring ignition duration, an engineer estimates that the standard deviation is 0.05…

A: We want to find the sample size (n)

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

A:

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: In a study of 90 grade nine students, the mean number of hours per day they are online for  their…

A: We have given that Mean(µ) = 4.8 Standard deviation of the population (σ) = 0.4  n = 9

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.6 and a standard…

A:

Q: If the variance of a Bar examination is 900, how large a sample is needed to estimate the true mean…

A: Variance=σ2=900, margin of error=moe=5, level of significance=0.01

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 class of 25 statistics students has a mean exam score of 80 with a standard deviation of 6 points.…

A: Note: Thank you for the question. Since multiple questions are posted, according to our policy, we…

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

A:

Q: The lengths of human pregnancies can be described by a Normal model with a mean of 268 days and a…

A:

Q: A sample of n = 100 scores is selected from a population with μ = 80 with σ = 20. On average, how…

A: Given information- Population mean, µ = 80 Population standard deviation, σ = 20 Sample size, n =…

Q: For a random sample of 36 data pairs, the sample mean of the differences was 0.75. The sample…

A:

Q: How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters?…

A: Solution: It is given here that the confidence level is 95% The margin of error, E = 3 The…

Q: A report in 2019 showed that 65.2% of 5500 internet users use google chrome as their primary web…

A: Given Information: 2019 Sample: Sample size (n1) = 5500 Sample proportion (p^1) = 65.2% = 0.652 2020…

Q: Having data normally distributed, means that how much of the data will lie between ± 1 standard…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.6 and a standard…

A: Given: x~N(μ,σ)μ=95.6σ=24.3

Q: In order to estimated the annual cost of full-time employees absences due to child care issues, a…

A: a) The sample size is calculated by using the formula: The critical value for 90% confidence level…

Q: It has been claimed that over 30 percent of entering college students have blood cholesterol levels…

A: The appropriate test for the given claim is one sample t test over the hypothesis, H0 : μ≥200 Ha ;…

Q: In a specific year, SAT scores were Normally distributed with mean 1026 and standard deviation 209;…

A: Solution-: (a) Given: μ=1026,σ=209 We find P(scores will be above 1300)=? (b) Given: μ=1500,σ=250 We…

Q: A sample of 100 bulbs of brand A gave a mean lifetime of 1200 h, with an SD of 70 h, while another…

A:

Q: A supermarket selected a sample of 200 of its customers and measured how long they took to be served…

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: Assume that adults have iq scores that are normally distributed with a mean of 97.9 and a standard…

A:

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

A:

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: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…

A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…

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: the sample size needed to estimate a population mean with 2 units with 95% confidence when the…

A:

Q: For a random sample of 36 data pairs, the sample mean of the differences was 0.77. The sample…

A: NOTE: Since we only answer up to 3 subparts , we will answer the first 3. Please resubmit the…

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: In a group presentation, the average geometric reasoning of Grade 10 students in a Mathematics camp…

A: It is given that the mean is μ=80 and the standard deviation is σ=4 Hence the p value is given by:…

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: In most cases of study, the statistical analysis is not giving the precise value of measurement but…

A: It is because in most cases we don't have data on the entire population but only a small part of it…

Q: If the variance of the water temperature in a lake is 25°, how many days should the researcher…

A: Given information- Variance σ2 = 25˚ So, standard deviation, σ = 5 Confidence interval = 0.99…

Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A: Given data E=2 s=13.4

Q: Suppose you could take all samples of size 77 from a population with a mean of 12 and a standard…

A: Given data, Mean μ=12 sd      σ=3.2 n=77 standard deviation of the sample means σx=?

Q: Suppose that a company makes light bulbs with a mean life of 310 hours, and a standard deviation of…

A: Given that, Mean, mu= 310 And standard deviation, sigma= 47 We know that, Z Score= (X-mu)/sigma

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: the sample size needed to estimate a population mean within 2 units with 95% confidence when the…

A: From the provided information, Population standard deviation (σ) = 8 Margin of error (E) = 2…

Q: The NCHS reported that the mean total cholesterol level was 203 for all adults in 2003. Patients…

A:

Q: A sample of n = 16 scores is selected from a population with μ = 80 with σ = 20. On average, how…

A: From the provided information, it is known that

Q: Suppose that a company makes light bulbs with a mean life of 310 hours, and a standard deviation of…

A: (1) Obtain the Z-score of a light which lasts 293 hours.  The Z-score of a light which lasts 293…

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.