The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6 years for whites and 33 years for nonwhites. (Click here for reference data ) Suppose a survey of randomly selected death records for white and nonwhite people born in 1900 from a certain county is conducted. Of the 118 whites surveyed, the mean life span was 46 years with a standard deviation of 11.8 years and of the 95 nonwhites, the mean life span was 37.9 years with a standard deviation of 14 years. Conduct a hypothesis test at the 0.01 level of significance to determine whether there was no difference in mean life spans in the county for whites and nonwhites in year 1900.

Q: 1. A random sample of size n = 9 yields the following observations: 75 78 77 76 74 75 74 76 75 Find…

A: 75, 74, 78, 77, 76, 75, 74, 76, 75

Q: Does this statement make sense or not? our study measured the birth weights and incidents of…

A: Here we want to Know that the given statement make sense or not.

Q: Suppose when a data set with 32 values is treated as a "population", the value of the (population)…

A: Given that  Population Variance = 145.2  n = 32

Q: A certain dataset has the following values: Mean = 40; Median = 30; Mode = 30 What is the shape of…

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

Q: In order to have the standard error of the mean be 13, what from a normally distributed population…

A: From the provided information, Standard error (SE) = 13 Population standard deviation (σ) = 65

Q: If the mean of a list of numbers is 16.7 and the standard deviation is 0,

A: Mean is a measure of central tendency. It is one of the most important measures to find out around…

Q: Which kind of descriptive statistics can be included to summarize the quantitative data? if the…

A:

Q: What is the sum of the deviation scores for the data in the frequency distribution table below?

A: Sum of deviation  of scores from mean is always zero.

Q: A statistics professor announces that 15% of the grades he gives are As. The results of the final…

A: It is given that the mean and standard deviation are 83 and 6, respectively.

Q: A government agency provides the number of miles that residents of the 75 largest metropolitan areas…

A: The random variable X follows normal distribution. There are two samples of data which are named as…

Q: If a set of exam scores forms a symmetrical distribution, what can you conclude about the students’…

A: The set of exam scores forms a symmetrical distribution.

Q: Suppose a population has a mean happiness score of 75 and a standard deviation of 15. Researcher A…

A:

Q: If the distribution of scores were normally distributed, the following would be true? -Mean = 36.5,…

A: Answer : - Given, the distribution of scores were normally distributed.                   Find the…

Q: ketch a bell curve for the ACT composite data with markings on the horizontal axis for ±1 standard…

A: here given , For the ACT, the mean composite score was 21.0 with a standard deviation of 5.2.

Q: A researcher collected data on the palate length of 50 individual shrews of the same species.. She…

A: In this question, a researcher has collected data on the palate length of 50 individual shrews of…

Q: Assume that the heights of American men are normally distributed with a mean of 69.1 inches and a…

A: From the given information we find the solution

Q: if the sample mean is 10, the population standard deviation is 20, and the sample size is 25, then…

A:

Q: if a data sample has a mode of 140, a median of 130, and a mean of 120 is the distribution of the…

A: We have given thatMode = 140Median = 130Mean = 120

Q: Suppose a claim is made that the mean age of members of a golf club is 52 years. The population…

A: Given: μ = 52 σ = 6 n = 50 X = 56 Formula Used: Test-statistic Z = X-μσn

Q: person would need to be in each of the following top percentages. (a) 3% (b) 9%

A: It is given that  Mean, μ = 100 Standard deviation, σ = 11

Q: Will exactly half of the observations in a sample fall below the mean? If answer is no, give a…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Suppose 36% of movie goers say comedy is their favorite genre. If a random sample of 120 movie goers…

A: Obtain the mean number of movie goers that prefer comedy. The mean number of movie goers that prefer…

Q: What is the relationship between the mean of a population and the mean of its sampling distribution?

A:

Q: A grocer finds that the cantaloupes in his store have weights with mean 0.7 kg and standard…

A: Given, Mean weight of cantaloupes is 700 gm. Standard deviation is 53 gm

Q: Identify the mean, median and mode based from the data below.

A: Step 1:  Step 2:  Step 3:

Q: A quantitative data set has size 50. At least how many observations lie within three standard…

A: The size of the data set is 50.

Q: he mean GPA of all 45,038 students at Uneeda College is 3.21. A random sample of 50 GPAs from the…

A: given data  mean GPA of all 45,038 students at Uneeda College is 3.21. A random sample of 50 GPAs…

Q: one study, bDrain weig men are ormally distributed wiLI kg and dala to answer parts (a) Click here…

A: According to a study, the brain weight of men is Normally distributed with a mean of 1.10 kg and a…

Q: IS IT REASONABLE TO ASSUME THIS SAMPLE CAME FROM A NORMAL POPULATION?

A: we need to answer, if it is reasonable to assume the given sample came from a normal population.

Inverse Normal Distribution

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.

Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.