If a sample has 20 observations and a 90% confidence estimate for μ is needed, the appropriate t-score is?

Q: If X = 117, o=24, and n = 30, construct a 99% confidence interval estimate of the population mean, µ

A: It is given that Sample size n = 30 Sample mean = 117 Population SD = 24

Q: Ten wind speed readings gave an average speed of 1105 cm/sec. From the previous records the standard…

A: It is given that sample mean is 1,105 and the population standard deviation is 240.

Q: If x= 88, o = 18 and n = 52, assuming that the population is normally distribution, construct a 95%…

A: Answer: From the given data, Mean (X¯) = 88 Standard deviation(σ) = 18 Sample size(n) = 52 95%…

Q: Let the mean of the chance sample drawn from a population whose variance is known as 16 and normally…

A:

Q: Suppose that the pulse rates of adult males vary from a low of 30 bpm to a high of 110 bpm.  Assume…

A: pulse rates of adult males vary from Low =30 bpm High=110 bpm confidence level=95% Margin of…

Q: With 80% confidence, for the sample proportion 0.50 and sample size 20, what is the upper confidence…

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Q: To give a 99.9% confidence interval for a population mean µ, you would use the critical value O z* =…

A: 99.9% confidence interval is given.

Q: When the sample size n is large, the 90% confidence interval for uy A) Y± 1.96SE(Y). B) Yt1.640y. C)…

A: It is given that, Sample size is large then we can use the Z distribution. Given, Confidence level…

Q: Use the given confidence interval to find the margin of error and the sample mean. (13.2,20.2) The…

A: Given: confidence interval = (13.2, 20.2)

Q: The number of cars sold annually by used car salespeople is normally distributed with a standard…

A: The provided sample mean number of cars sold annually is X¯=74 and standard deviation is σ=13. The…

Q: Assume that all​ grade-point averages are to be standardized on a scale between 0 and 4. How many​…

A: Solution : Given : e = 0.013            σ = 1 confidence level = 0.98 Therefore z-score…

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

A: The formula for the sample size is as follows:

Q: Determine the minimum sample size required when you want to be 95​% confident that the sample mean…

A: Given,margin of error(E)=1standard deviation(σ)=13.9α=1-0.95=0.05α2=0.025Z0.025=1.96    (from…

Q: If n = 108, ¯xx¯ = 29 and σσ = 2.6, construct a 91% confidence interval. Give your answers to three…

A: Given Data: x¯=29σ=2.6n=108   z-value corresponding to 91% confidence level=1.695

Q: Find the critical value for 93% confidence interval, n = 160  and  HA: ρ ≠

A:

Q: The 87.19% confidence interval estimate for p was (0.2, 0.38). Find p′ and ME. pp′=  ME=

A: Given87.19% confidence interval estimate for p was (0.2 , 0.38)

Q: For a confidence level of 80% with a sample size of 8, find the critical t value.

A:

Q: We want to estimate a population mean u of a population with a standard deviation s=12. What size…

A: We have given that,  Population standard deviation (σ) = 12, confidence interval (c.i) = 95% = 0.95…

Q: The number of cars sold annually by used car salespeople is normally distributed with a standard…

A:

Q: Which choice is the correct formula for a 99% confidence interval for a mean? ?±?∗??√ ?±?∗??μ±z∗σn…

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Q: A t value is to be used in calculating a 99% confidence interval for the population mean μ, based on…

A:

Q: A researcher wants to determine de 99% confidence interval for the mean number of hours per week…

A: The desired level of confidence is 99%. For the distribution of the spent time in community services…

Q: a sample of n=16 scores has mean of M=58 with SS=540. Use the sample to construct the 95% confidence…

A: Solution: From the given information, n=16, M=58 and SS=540.

Q: Determine the minimum sample size required when you want to be 95% confident that the sample mean is…

A:

Q: What is tα/2,df for a 95% confidence interval of the population mean based on a sample of 15…

A: Solution: We have to find the t-critical value (tα/2) at the given significance level 1- 0.95=0.05…

Q: For a sinlge sample of n=23, the t values used to determine the 90% confidence interval are

A: Obtain the degrees of freedom. The degrees of freedom is obtained below: Thus, the degrees of…

Q: Find the critical value tv for the confidence level c=0.98 and sample size n=6. Use the…

A:

Q: Find the critical value for 93% confidence interval, n = 160  and  HA: ρ ≠

A: Given n=160 and confidence level is 93$%. Test is two tailed.

Q: Use the sample information X = 36, o= 7, n= 16 to calculate the following confidence intervals for µ…

A: (a). Find the 90% confidence interval for the population mean µ: Denote the population mean as µ.…

Q: Determine the minimum sample size required when you want to be 95​% confident that the sample mean…

A: Solution: From the given information, confidence level is 0.95, σ=17.9 and E=1.

Q: We want to determine the mean weight of a certain type of fish. If we also want to estimate u to…

A: Given that, Critical values: Using the z-table, the critical value at 95% confidence level for two…

Q: If X=117, o=24, and n = 30, construct a 99% confidence interval estimate of the population mean, μ.…

A: GivenMean(x)=117standard deviation(σ)=24sample size(n)=30Confidence level=99%

Q: Specific Directions for Capstone Assessment • Refer to this problem. The set of questions will be…

A: Answer: Independent variable(x) = Percentage of roadways area Dependent variable (y) = Chloride…

Q: Determine the minimum sample size required when you want to be 95​% confident that the sample mean…

A:

Q: Use the sample information x⎯⎯x¯ = 35, σ = 7, n = 16 to calculate the following confidence intervals…

A:

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: Nitrate concentrations above 50ppm in groundwater are not desirable for human consumption.…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: Construct the confidence interval for the population mean μ   c=0.90 x=7.2, σ=0.6 , n=44 A 90%…

A:

Q: In order to construct a 99% Confidence Interval, we have to find the margin of error (ME), and we…

A: From the provided information, Confidence level = 99% Standard error (SE) = 0.049 The z value at 99%…

Q: Use the sample information x⎯⎯x¯ = 37, σ = 6, n = 15 to calculate the following confidence intervals…

A:

Q: In a right-tailed test comparing two proportions, the test statistic was zcalc = +1.5. The p-value…

A: a right-tailed test comparing two proportions, the test statistic was zcalc = + 1.5.

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.