Recent questions in Normal distributions

High school statisticsAnswered question

Kobe Dixon 2023-04-01

Read carefully and choose only one option

A statistic is an unbiased estimator of a parameter when (a) the statistic is calculated from a random sample. (b) in a single sample, the value of the statistic is equal to the value of the parameter. (c) in many samples, the values of the statistic are very close to the value of the parameter. (d) in many samples, the values of the statistic are centered at the value of the parameter. (e) in many samples, the distribution of the statistic has a shape that is approximately Normal

High school statisticsAnswered question

verfugtg5e 2023-02-08

The first 15 digits of pi are as follows: 3.14159265358979

The frequency distribution table for the digits is as follows:

$\begin{array}{|cc|}\hline DIGIT& FREQUENCY\\ 1& 2\\ 2& 1\\ 3& 2\\ 4& 1\\ 5& 3\\ 6& 1\\ 7& 1\\ 8& 1\\ 9& 3\\ \hline\end{array}$

Which two digits appear for 3 times each?

A) 1, 7

B) 2, 6

C) 5, 9<br<D) 3, 8

The frequency distribution table for the digits is as follows:

$\begin{array}{|cc|}\hline DIGIT& FREQUENCY\\ 1& 2\\ 2& 1\\ 3& 2\\ 4& 1\\ 5& 3\\ 6& 1\\ 7& 1\\ 8& 1\\ 9& 3\\ \hline\end{array}$

Which two digits appear for 3 times each?

A) 1, 7

B) 2, 6

C) 5, 9<br<D) 3, 8

High school statisticsAnswered question

Brenda Leach 2022-12-01

Which among the following is not a fundamental force of nature?

Gravitational Force

Electromagnetic Force

Buoyant Force

Weak Nuclear Force

Gravitational Force

Electromagnetic Force

Buoyant Force

Weak Nuclear Force

High school statisticsAnswered question

Scott Valenzuela 2022-11-29

Еhere is a question that worries me: Why is it correct to say a normal distribution and the standard normal distribution?

High school statisticsOpen question

Elisha Cancino2022-11-23

Scores for a common standardized college aptitude test are normally distributed with a mean of 490 and a standard deviation of 103. Randomly selected students are given a Test Preparation Course before taking this test. Assume, for sake of argument, that the preparation course has no effect.

If 1 student is randomly selected, find the probability that their score is at least 527.3.

P(*X* > 527.3) =

If 11 students are randomly selected, find the probability that their __mean score__ is at least 527.3.

P(¯¯¯X$\overline{X}$ > 527.3) =

High school statisticsAnswered question

Adison Rogers 2022-11-13

In general, when investigating a question of interest, you are not aware of the actual population statistic. However, by taking a simple random sample of an appropriate size, you can make inferences about the entire population. Also, the normal distributions are completely described by two statistics: the mean and the standard deviation. The standard deviation for a sampling distribution is given by

$\sqrt{\frac{p(1-p)}{n}}$

You used p = 0.20 and n = 100. To be more accurate, would you prefer to use n = 1000? Use the formula to evaluate standard deviations to support your answer.

$\sqrt{\frac{p(1-p)}{n}}$

You used p = 0.20 and n = 100. To be more accurate, would you prefer to use n = 1000? Use the formula to evaluate standard deviations to support your answer.

High school statisticsAnswered question

akuzativo617 2022-11-04

How are z-scores found for normal distributions where $$\mu \ne 0$$ or $$\sigma \ne 1$$?

High school statisticsAnswered question

Bruce Sherman 2022-10-02

Find k for the following probability distributions: P(x) = k(x + 2) for x = 1, 2, 3

High school statisticsAnswered question

Austin Rangel 2022-09-29

Determine whether the given statement is true or false. All normal distributions have a mean of 0.

High school statisticsAnswered question

Heergerneuu 2022-09-26

Determine whether the following statement is true: When random samples of 50 men and 50 women are obtained and we want to test the claim that men and women have different mean annual incomes, there is no need to confirm that the samples are from populations with normal distributions.

High school statisticsAnswered question

hommequidort0h 2022-09-26

Suppose that, for two populations, the distributions of the variable under consideration have the same shape. Further suppose that you want to perform a hypothesis test based on independent random samples to compare the two population means. In each case, decide whether you would use the pooled t-test or the Mann-Whitney test and give a reason for your answer. You know that the distributions of the variable are a. normal. b. not normal.

High school statisticsAnswered question

videosfapaturqz 2022-09-25

The normal distribution is a good estimate for which of the binomial distributions. n=30, p=0.4

High school statisticsAnswered question

Medenovgj 2022-09-24

Explain why t distributions tend to be flatter and more spread out than the normal distribution.

High school statisticsAnswered question

zaviknuogg 2022-09-24

The normal distribution is a good estimate for which of the binomial distributions. n=40, p=0.9

High school statisticsAnswered question

Ilnaus5 2022-09-24

Assume normal distributions in the following exercises. Find the value of z. The probability that a score is between z and -z is 0.82.

High school statisticsAnswered question

Alexus Deleon 2022-09-21

Assume normal distributions in the following exercises. Find the value of z. An estimated 86% of the scores are to the left of z.

High school statisticsAnswered question

manudyent7 2022-09-17

Assume normal distributions in the following exercises. Find the value of z. The probability that a score is to the left of z is 0.96.

High school statisticsAnswered question

Konciljev56 2022-09-14

In each of the following situations, which of the two distributions would be more spread out? Standard normal distribution or t-distribution with df = 10. t-distribution with df = 5 or t-distribution with df = 25. t-distribution with df = 100 or normal distribution with standard deviation = 100.

High school statisticsAnswered question

Iyana Jackson 2022-09-14

What factors determine the value of $$\alpha $$ for three distributions?

High school statisticsAnswered question

excefebraxp 2022-09-14

If x has a normal distribution with mean $$\mu =15$$ and standard deviation $$\sigma =3$$, describe the distribution of $$\overline{x}$$ values for sample size n where n = 4, n = 16 and n = 100. How do the $$\overline{x}$$ distributions compare for the various sample sizes?

Facing normal distributions tasks in statistics, start with a classic normal distribution data set example first and proceed from there as it will help you to see the distribution methods in statistical data. Turning to your textbook, consider using a normal distribution solver, and don’t ignore exploring various word problems below. If you are still feeling stuck, look into normal distribution questions and answers that have been posted. Don’t be shy to post your questions as well. Even if you need normal distribution exam questions explained, there is help that is available for your statistical needs and high-school-level learning.