Normal Distribution Examples
To use a normal approximation to the binomial, which of the following does not have to be true?
To use a normal approximation to the binomial, which of the following does not have to be true?
According to a report 77.3% of murders are committed with a firearm ( a) If 400 murders are randomly selected, how many would we expect to be committed with a firearm? (b) Would it be unusual to observe 338 murders by firearm in a random sample of 400 murders? Why?
According to a report 77.3% of murders are committed with a firearm ( a) If 400 murders are randomly selected, how many would we expect to be committed with a firearm? (b) Would it be unusual to observe 338 murders by firearm in a random sample of 400 murders? Why?
The number of qualified voters living in the household on a randomly selected Subdivision block is described by the following probability distribution. What are the variance and standard deviation respectively of the probability distribution?
The number of qualified voters living in the household on a randomly selected Subdivision block is described by the following probability distribution. What are the variance and standard deviation respectively of the probability distribution?
Suppose that the New England Colonials baseball team is equally likely to win a game as not to win it. If
5
Colonials games are chosen at random, what is the probability that exactly
4
of those games are won by the Colonials
Suppose that the New England Colonials baseball team is equally likely to win a game as not to win it. If
5
Colonials games are chosen at random, what is the probability that exactly
4
of those games are won by the Colonials
Mariel Feriamil2022-03-19Travel.By.Us is an internet-based travel agency wherein the customers can see vedios of the cities they plan to visit. the number of daily hits at its website is normally distributed with ú=1,000 and ō=240. What is the probability of getting fewer than 900 hits?
Travel.By.Us is an internet-based travel agency wherein the customers can see vedios of the cities they plan to visit. the number of daily hits at its website is normally distributed with ú=1,000 and ō=240. What is the probability of getting fewer than 900 hits?
The homework consists of 40 independent problems. On the average, it takes 5 minutes to solve a problem, with a standard deviation of 2 minutes.a. Find the probability that the homework will be completed in less than 3 mins.b. Find the probability that the homework will be completed between 1 - 2 mins.
Each month, households in a certain subdivision generate an average of 10 kg of newspaper for garbage or recycling. Assume the standard deviation is 1.5 kg. If a household is selected at random, find the number of households who were assumed to have between 7 kg and 11.5kg newspaper for garbage or recycling if the certain subdivision has approximately 15,000 households.
What is the probability that exactly 3 heads will appear if a coin is tossed 4 times
Country Financial, a financial services company, uses surveys of adults age 18 and older to determine if personal financial fitness is changing over time. A recent sample of 1000 adults showed 410 indicating that their financial security was more than fair. Just a year before, a sample of 900 adults showed 315
indicating that their financial security was more than fair.
a. State the hypotheses that can be used to test for a significant difference between the
population proportions for the two years.
b. Conduct the hypothesis test and compute the p-value. At a .05 level of significance,
what is your conclusion?
c. What is the 95% confidence interval estimate of the difference between the two
population proportions? What is your conclusion?
Country Financial, a financial services company, uses surveys of adults age 18 and older to determine if personal financial fitness is changing over time. A recent sample of 1000 adults showed 410 indicating that their financial security was more than fair. Just a year before, a sample of 900 adults showed 315
indicating that their financial security was more than fair.
a. State the hypotheses that can be used to test for a significant difference between the
population proportions for the two years.
b. Conduct the hypothesis test and compute the p-value. At a .05 level of significance,
what is your conclusion?
c. What is the 95% confidence interval estimate of the difference between the two
population proportions? What is your conclusion?
Yandel Hunter 2022-02-12C) According to the 2 Standard Deviation Rule, data values that are more than 2 standard deviations away from the mean of the distribution are considered to be "unusually high" or "unusually low."
Trystan Horne 2022-02-12The manager of the store in the preceding exercise calculated the residual for each point in the scatterplot and made a dotplot of the residuals.
The distribution of residuals is roughly Normal with a mean of $0 and standard deviation
of $22.92.
A. What percent of the actual sales amount do you expect to be within $5 of their expected sales amount.
B. The middle 95% of residuals should be between which two values? Use this
information to give an interval of plausible values for the weekly sales revenue if
5 linear feet are allocated to the stores
The distribution of residuals is roughly Normal with a mean of $0 and standard deviation of $22.92.
A. What percent of the actual sales amount do you expect to be within $5 of their expected sales amount.
B. The middle 95% of residuals should be between which two values? Use this information to give an interval of plausible values for the weekly sales revenue if 5 linear feet are allocated to the stores
The number of hours per week that the television is turned on is determined for each family in a sample. The mean of the data is 3131 hours and the median is 27.227.2 hours. Twenty-four of the families in the sample turned on the television for 1616 hours or less for the week. The 11th percentile of the data is 1616 hours.
Step 4 of 5 :
What is the value of the 50th percentile?
Terrance Khan 2022-02-118. The percent of persons (ages 5 and older) in each state who speak a language at home other than English is approximately exponentially distributed with a mean of 9.848. Suppose we randomly pick a state.
Francisca Rodden 2022-01-06A normal distribution has a mean of 80 and a standard deviation of 14. Determine the value above which 80 percent of the values will occur.
A normal distribution has a mean of 80 and a standard deviation of 14. Determine the value above which 80 percent of the values will occur.
Osvaldo Apodaca 2021-12-259. The purpose of statistical inference is to provide information about the.
a. sample based upon information contained in the population.
b. population based upon information contained in the sample.
c. population based upon information contained in the population.
d. mean of the sample based upon the mean of the population.
10. Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are.
a. 200 and 18.
b. 81 and 18.
c. 9 and 2.
d. 200 and 2.
a. sample based upon information contained in the population.
b. population based upon information contained in the sample.
c. population based upon information contained in the population.
d. mean of the sample based upon the mean of the population.
10. Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are.
a. 200 and 18.
b. 81 and 18.
c. 9 and 2.
d. 200 and 2.
Ashley Bell 2021-12-24An important factor in solid missile fuel is the particle size distribution. Significant problems occur if the particle sizes are too large. From production data in the past, it has been determined that the particle size (in micrometers) distribution is characterized by
a) Verify that this is a valid density function.
b) Evalute F(x).
c) What is the probability that a random particle from the manufactured fuel exceeds 4 micrometers?
a) Verify that this is a valid density function.
b) Evalute F(x).
c) What is the probability that a random particle from the manufactured fuel exceeds 4 micrometers?
Kelly Nelson 2021-12-20X~N(335, 50).
Find the z-score corresponding to an observation of 284.
-1.02
6.7
1.02
-6.7
Find the z-score corresponding to an observation of 284.
-1.02
6.7
1.02
-6.7
Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. In a survey of 2149 U.S. adults in a recent year, 1241 made a New Year's resolution to eat healthier.
Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. In a survey of 2149 U.S. adults in a recent year, 1241 made a New Year's resolution to eat healthier.
socorraob 2021-12-12Suppose
