What is the expected value?1.221.051.771.50 For #s 7 - 8, refer to the problem below:A hospital researcher is interested in the number of times the average post-op patient willring the nurse during a 12-hour shift for a random sample of 50 patients. The followinginformation was obtained.124P(x)0.080.160.320.280.120.04What is the expected value?2.321.520.882.00

Let X be the random variable having probability mass function is, X 0 1 2 3 4 5 P(x) 0.08…

Answered: For #s 7- 8, refer to the problem…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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T6.14. According to the Census Bureau, 13% of American adults (aged 18 and over) are Hispanic. An opinion poll plans to contact an SRS of 1200 adults. (a) What is the mean number of Hispanics in such sam- ples? What is the standard deviation? (b) Should we be suspicious if the sample selected for the opinion poll contains 15% Hispanic people? Compute an appropriate probability to support your answer.
A random sample is drawn from a population with mean = 66 and standard deviation a=5.5. [You may find it useful to reference the z table.). a. What is the expected value and the standard error of the sampling distribution of the sample mean with n=16 and n= 36. (Round the standard error to 3 decimal places.) n 16 36 Expected Value Standard Error b. Can you conclude that the sampling distribution of the sample mean is normally distributed for both sample sizes? Yes, both the sample means will have a normal distribution. O No, both the sample means will not have a normal distribution. O No, only the sample mean with n= 16 will have a normal distribution. O No, only the sample mean with n= 36 will have a normal distribution.
Ex. The following is the distribution of the readings obtained with a Geiger counter of the number of particles emitted by a radioactive substance in 100 successive 40-second intervals: Number of 5-9 10-14 15-19 20-24 25-29 30-34 35-39 particles frequencies 10 37 36 13 Find the sample mean and sample standard deviation b. Find the probabilities that a random variable having a normal distribution with population mean and standard deviation as in (a) above will take on values in the table above a. с. Find the expected normal curve frequencies for the various classes Test at 0.05 significance level, whether the data may be looked upon as a random sample from a normal population d. the C part very
If ?X is a binomial random variable, compute the mean, the standard deviation, and the variance for each of the following cases:
EX#3: A lot contains 7 components; 4 good components and 3 defective components. A sample of 3 is taken. Find the expected value of the number of good components in this sample.
Refer to the accompanying table, which describes results from groups of 8 births from 8 different sets of parents. The random variable x represents the number of girls among 8 children. Find the mean and standard deviation for the number of girls in 8 births
2. In a recent study on world happiness, participants were asked to evaluate their current lives on a scale from 0 to 10, where 0 represents the worst possible life and 10 represents the best possible life. The responses were normally distributed, with a mean of 5.4 and a standard deviation of 2.2. Find the probability that a randomly selected study participant's response was: a. Less than 4 b. Between 4 and 6 c. More than 8
#8 D
H7
Which of the following is not one of the assumptions made in the analysis of variance? O A. None of these O B. The different populations all have the same mean. O C. The different populations all have the same standard deviation o O D. The distribution of the response variable is a normal. O E. Each sample is an independent random sample.
Suppose that a medical clinic wants to test whether there is a relationship between sex and age class in the number of deaths caused by cancer. The table shows the observed frequencies (counts) of a simple random sample of 117 deaths related to cancer. Younger than 45 45 and older Total Male 8 60 68 Female 4 45 49 Total 12 105 117 Does this sample meet the requirements for conducting a chi-square test for independence? The sample does not meet the requirements because the expected frequency in at least one cell is less than 10. The sample does not meet the requirements because the expected frequency in at least one cell is less than 5. The sample does not meet the requirements because the observations are not independent. The sample meets the requirements because the observed frequency in each cell is at least 5. The sample meets the requirements because the expected frequency in each cell is at least 5.

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