It is known that the population variance (σ2) is 144. At 95% confidence, what sample size should be taken so that the margin of error does not exceed 5?

Q: Using traditional methods, it takes 103 hours to receive a basic driving license. A new license…

A: Suppose, X be the time required to receive a driving licence. Assume that X follows Normal…

Q: A psychologist is interested in the score of college students on the GRE. In the general population…

A:

Q: 3. A researcher suggests that male nurses earn more than female nurses. A survey of 16 male nurses…

A: According to the given information in this questionWe need to answer all four steps

Q: When engaging in weight-control (fitness/fat burning) types of exercise, a person is expected to…

A: Given information, n=41x¯=107s=9000=94.8683μ=120

Q: 6. The ages of a certain group of students in a school follow a normal distribution with a mean of…

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

Q: Which statement is true? If tou rejected the null hypohesis at alpha

A: A hypothesis testing can be performed either by p-value method or the critical value method.

Q: to population variance, we get an estimate of the sample variance by ① . This is known as ② . This…

A: Population Mean and Variance μ = 1n∑i=1nxiσ2 =1n∑i=1nxi-μ2 Sample mean and variance x¯=1N∑i=1Nxi…

Q: A manufacturer of chocolate chips would like to know whether its bag filling machine works correctly…

A: Denote μ as the true mean amount to which the machine fills the bags at the 430 gram setting.

Q: Use the data in Problem 1 and pool the data across the treatménts into one sample of size n = 250.…

A: Null Hypothesis: H0: The distribution of the percent wound healing is not approximately normal.…

Q: compared to the day after Christmas? The 58 randomly surveyed shoppers on the day after Thanksgiving…

A: Solution-: Given:   for sample 1             and   for sample 2                   We find (a)…

Q: What is the margin of error for a 99% CI for a mean, when the sample size is 12, the sample average…

A: Given: Sample size, n = 12 Sample mean, x = 52 Sample standard deviation, s = 13 It follows a…

Q: omplete the following problems (from your textbook) for Week 2: .10 he file Mobileloyalty contains…

A: We compute the summary statistics using the step by step procedure in excel as below: Enter the…

Q: a(n). . . test ...... To test the equality of two variances, you would use Chi-square

A: We will F test to test the equality of two variances.

Q: When variance is unknown (if the population is finite with mean When variance is unknown (if the…

A:

Q: Suppose you know that the population variance for the weight of tractors is 4,000,000. What sample…

A:

Q: What mathematical operations could I do to every score in my distribution list that would have no…

A: Mathematical operation  Adding/subtracting

Q: how large of a sample is required to estimate the mean usage of electricity? Round your answer up to…

A: Given, Margin of Error (ME) =0.1Variance =σ2=4Mean = μ = 19.6

Q: Problem #1: We would like to determine whether the true mean pH level of a lake differs from 6.5.…

A: Population mean μ=6.5Sample mean x¯=5.9Standard deviation s=0.895% Confidence interval true mean…

Q: QUESTION 3 Manama cement factory produces precast cement blocks, last year's record showed the mean…

A: Given problem Given that   Manama cement factory produces precast cement blocks, last year's…

Q: The electric cooperative needs to know the mean household usage of electricity by its non-commercial…

A: Givenmargin of error(E)=0.09Variance(σ2)=1.96standard deviation(σ)=1.96=1.4confidence level=80%

Q: The next seven questions refer to the following scenario: A random sample of 16 Porsche drivers…

A: From the provided information, it is obtained that: For Porsche Drivers:n1=16, x¯1=50, s12=9For…

Q: A Moving to another question will save this response. Question 5 1- How many engineering students…

A:

Q: You take a sample of size 190 and get 23 successes. Confirm that the sample size was large enough to…

A: Given that Sample size (n) = 190  probability of success (p) = 23/190 = 0.12

Q: How to solve for question 2-4?

A: Question 2: Sample statistics of the two samples:The given statistics for the two randomly selected…

Q: A manufacturer of chocolate chips would like to know whether its bag filling machine work correctly…

A: Solution-: Given:  We find, (a) Hypothesis  (type of test) (b) Test statistic (c) Critical value (d)…

Q: Earlier this semester, we learned to use 2-Sample-TTest to compare the population means of two…

A: Solution: From the given information,

Q: Suppose you are interested in studying regional differences in crime rates.  You take a random…

A: Given that; South n = 100 X1 = 55 ?1 2 = 5.78 North  n = 100 X2 = 50 ?2 2 = 6.72 By using two sample…

Q: Before using these variance estimates, what must we calculate?

A: Before using any variance estimate we should check whether it is biased or unbiased and calculate…

Q: Tim is a researcher who is dealing with a SAMPLE of scores.  The SAMPLE of scores is: 15, 17, 19,…

A: Given data is 15, 17, 19, 22, 10, 23, 16, 15S.S=122.88

Q: If you were to draw samples of size 59 from this population, in what range would you expect to find…

A: Given data:     The given mean value is: μ=261 days. The standard deviation is: σ=16 days. The given…

Q: The water works commission needs to know the mean household usage of water by the residents of a…

A: The margin of error is 0.13 and the variance is 2.56.

Q: What do you conclude, using the correct statistical language! You fail to reject the null You reject…

A:

Q: A population of scores has a mean of µ=70, a median of 65 and a mode of 60. What is the most likely…

A: From the provided information, Mean (µ) = 70 Median = 65 Mode = 60

Q: One sample from an independent-measures study has n=16 with a variance of 65, the other sample has…

A:

Q: average family the variance is 5.29 kW and the mean is 19.9 kW per day. If they are using 80% level…

A: Given : Margin of error, ME = 0.14 population standard deviation, σ = √5.29…

Q: A production engineer wants to determine if two assembly lines are producing the same mean number of…

A:

Q: A sample of n = 9 scores has SS = 72. The variance for this sample is s2 = 9. True or False

A: Given sample of n = 9 scores has SS = 72.

Q: What is your test-statistic? tTest- O 2.058 O 2.508 O 2.805 2.850

A: Given Information: Porsche Driver: Sample size n1=16 Sample mean x¯1=50 Variance s12=9 Standard…

Q: A study of scat belt users and nonusers yielded the randomly selected sample data summarized in the…

A: Note: Since part A is only posted. The answer will be given for the posted question. Please provided…

Q: ? Estimates of variance can be used to test a hypothesis because?

A: These estimates are formulated to interpret the means and also to discuss whether the sample means,…

Q: Four Engineering teams played last weekend. The following are the descriptive measures of their…

A:

Q: A therapist would like to evaluate an intervention for treating depression.  A sample of n = 20…

A: From the provided information, Sample size (n) = 20 Level of significance (α) = 0.05 Mean difference…

Q: an operation manager at an electronic company wants to test their amplifiers. the design engineer…

A:

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.