Why do we divide the numerator by N-1 instead of N when calculating the standard deviation?    Group of answer choices a). To increase the sample size. b). To account for smaller samples having less dispersion. c). To reduce the discrepancy between the sample statistic and the population parameter. d). To make sure dispersion is centered around the mean.

Q: Find the sample size need to find the Population Mean if the margin of error is $105, the confidence…

A: Solution: From the given information, confidence level is 0.95, σ=315 and E=105.

Q: Which of the following statistics are unbiased estimators of population parameters? Choose the…

A:

Q: One-Sample Statistics Std. Deviation Std. Error Mean Mean hrs1 NUMBER OF HOURS WORKED LAST WEEK 895…

A: From the given output, it is clear that t test had been done. 1. The test done was One sample t test…

Q: A Student Gender Hours online/week Friends 1 male 2 female 50 L30 3 female 4 female 70 2.

A: Given: The data given is as below Hours online/week Friends 4 90 2 50 2 30 5 70 5 70…

Q: A histogram is used to understand:

A: Histogram describes the frequency of the data using bars.

Q: 2. a. The Intelligence Quotient (IQ) of adults is approximately normally distributed with mean 100…

A: Given that

Q: 10. What is the sample variance here? a. 6.67 b. 7.27 c. 8.35 d. 4.95 e. 6.91 11. What is the sample…

A: The sample variance of the given dataset can be calculated as follows: Sample…

Q: The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget…

A: Given,Mean, μ = 62 ounces.Standard deviation, σ = 9 ounces.The distribution of widget weights is…

Q: 2. ) Find the items asked below. Answer with 2 places to the right of the decimal if necessary.…

A: As per our guidelines we suppose to answer only three sub parts. Given data is85 , 88, 84, 83, 83,…

Q: O B. The number of babies that were born C. The number of births per capita D. The weights of the…

A:

Q: a) How much more cereal do you expect to be in the large bowl? b) What's the standard deviation of…

A: Let X is the random variable representing the small bowl and Y the random variable representing the…

Q: What test statistic will be used if the sample size is below 30? a. t-test b. z-test c.…

A: What test statistic will be used if the sample size is below 30?

Q: 5

A: The dependent t-test (called the paired-samples t-test) compares the means between two related…

Q: Q1. Erythrocytes were examined by light microscopy and found to have the following diameter: 4.7,…

A: Mean is the measure of central tendency. It is calculated by adding all the values and divide it by…

Q: In a normal distribution, 99.7% of the data fall within how many standard deviations of the mean? A.…

A: Solution-: In a normal distribution, 99.7% of the data fall within how many standard deviations of…

Q: ne desires a A researcher wishes to estimate the mean height of women aged between 60 margin of…

A: Given The desired margin of error =0.2 inches, and the standard deviation=3,5 inches. Need to…

Q: Find the estimated standard error for the sample mean for n = 16 and SS = 3922. Nearest hundredths…

A: We find the standard error using the formula

Q: When a sample size from a population is n = 1, then the standard error will always equal the _____.…

A: Given that, Sample size, n = 1

Q: 1. make a survey report of the number of students per section from grades 7-9 2. create a sampling…

A: The sampling distribution is the distribution of the means of the samples. The mean of the sampling…

Q: Calculate the standard deviation for the following sample of 4 observations. Individual Income 1. 62…

A: Below is the answer

Q: The weight of newborn babies in James Gordon Memorial Hospital is normally distributed with a mean…

A: Let X denotes the weight of newborn babies in James Gordon Memorial Hospital. Given that…

Q: (a) Find the standard error of the mean for each sampling situation (Round your answers to 2 decimal…

A: Given : From image given in a question a. σ=16, n=16 b. σ=16, n=64 c. σ=16, n=256

Q: A fitness trainer is interested in investigating whether ethnicity and the first exercise activity…

A:

Q: You interview 100 college sophomores , and you ask how much they earned the previous summer. You…

A: We have given that the 100 sophomores. Here we need to use the median to describe the centre of the…

Q: What is the standard deviation of the following sample data: 16, 15, 41, 28, 20, 34. Round to 2…

A:

Q: For which quartile , 25% observations are greater and 75% are smaller ? A. First quartile B Third…

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

Q: The z statistic indicates:

A: here we will use basic of Normal distribution  z- score or z-statistic is Standard Normal Random…

Q: ou are given the following numbers: 3. 3 11 4 Calculate the unbiased sample standard deviation.…

A: Given sample is: 3,3,8,1,4. Sample size = n = 5. Unbiased estimate of population standard deviation…

Q: The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget…

A: Empirical rule: If a population has bell-shaped distribution with mean µ and standard deviation σ ;…

Q: Use the information below to determine how many standard deviations from the mean will the following…

A: Given : μ=36.4032n=129σ=64.3382x¯=12.5719

Q: Using the following sample data, calculate the mean, variance, and standard deviation. 225 325 275…

A: Ans#- Given the following data           225, 325, 275, 250, 375

Q: Find the mean, standard deviation, and variance, given the following sample data. (Round your…

A: 1 The mean is,

Q: Find the sample standard deviations for the following sample data. Round your answer to the nearest…

A: From the provided information, The data values are as follow: x: 23, 20, 14, 35, 28 Number of…

Q: The governor of a state wanted to assess the public education system of the state. She instructed a…

A: Solution: Given information: n= 225 Sample size μ= 74  Population mean σ= 20  Population standard…

Q: Examine the normal quantile plot and determine whether it depicts sample data from a population with…

A:

Q: What is the biggest difference about creating a sampling distribution for standard deviation…

A: The objective is to infer the difference between the sampling distribution for the sample mean and…

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.