Sample Proportion Question: In a normal distribution, what is the probability that a random sample of 422 with population proportion 0.15 has a sample proportion of more than 0.15? Level of difficulty = 2 of 3 Please format to 3 decimal places. Answer:

Q: After 8 points are added to each score in a sample, the mean is found to be M = 40. What was the…

A: Let us have n number of scores in a sample. After adding 8 to each score sample mean will be M = 40…

Q: Karen wants to estimate the mean number of siblings for each student in her school. She records the…

A: Given, Karen records the number of siblings for each of 200 randomly selected students in the…

Q: Which z-score is the nearest to the mean? +0.50 +0.75 +1.00 -0.25

A: We will find z-score is the nearest to the mean? +0.50 +0.75 +1.00 -0.25 ?

Q: When the Standard Score = -1, what is the percentile of the raw score? %3D O 2nd 14th O 16th 34th…

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

Q: What z-score values separate the middle 99% of the distribution from the rest of the scores?…

A: Obtain the z-score values separate the middle 99% of the distribution from the rest of the scores.…

Q: What z-score values separate the middle 50% of the distribution from the rest of the scores? -0.84…

A: Obtain the z-score values separate the middle 50% of the distribution from the rest of the scores.…

Q: A sample mean has a z= -4.0 on the sampling distribution created from the population of psychology…

A:

Q: Samples of size n=4000 are randomly selected from a population of homeowners in Florida. The square…

A: Samples of size n=4000

Q: Adding a score that is equal to the mean of the distribution will NOT change

A: Adding a score that is equal to the mean then.

Q: Suppose a variable is normally distributed. What percentage of scores fall between one standard…

A:

Q: PLS HELP In a normal distribution, what z-score cuts off the top 20% of the distribution? z = -1.96…

A:

Q: ​Claim: Fewer than 95​% of adults have a cell phone. In a reputable poll of 1073 ​adults, 90​%…

A: Formula for Test statistic  Test statistic ( z ) z = ( p^ - p ) / ( √( p * ( 1 - p) / n) )

Q: what percent of the total population is found between the mean and the z-score given? z=3.58

A: We have given that. Standard normal.  X~N( 0 , 1 )   μ =0  , ? =1   Z-score =( x - μ )/?   z= 3.58

Q: The value of the stanard error of the mean for the scores :  1,2,3,4,5 ?

A: Solution: Let X be the random variable. The given data is 1, 2, 3, 4 and 5.

Q: A simple random sample of 28 observations was taken from a large population. The sample mean equaled…

A: It is given that, a simple random sample of 28 observations was taken from a large population with…

Q: Calculate normalcdf(106,125,100,15) and give the result. You may check it by finding the z-scores…

A: Normal distribution is also known as Gaussian distribution. It is a type of continuous distribution.…

Q: Reponse time for seven emergency phone calls in a large metropolitan area were measured to the…

A:

Q: estimate the sample size

A: An estimate of sample size: The appropriate sample size for estimating the mean of a variable from…

Q: The FICO credit score is used by banks and other lenders to determine whether someone is a good…

A: sample size(n)=100Mean()=703standard deviation()=92significance  level()=0.05

Q: DefineSAMPLING DISTRIBU TION OF THE SAMPLE MEAN FOR NORMAL populaTION when the variance is: A.…

A: Given that  We have to define the Sampling distribution of the sample mean for normal population…

Q: You are conducting a multinomial hypothesis test (a = 0.05) for the claim that all 5 categories are…

A: There is one categorical variable. It has 5 categories. The observed and expected values are given.…

Q: n a recent year, the Better Business Bureau settled 75% of complaints they received. (Source: USA…

A: Central limit theorem: For a simple random sample of size n drawn from a population, the sampling…

Q: he ages​ (in years) of a random sample of shoppers at a gaming store are shown. Determine the​…

A: Given data set,   12​, 15​, 23​, 13​, 15​, 18​, 20​, 18​, 15​, 15   The objective is to determine…

Q: 50 people are selected randomly from a certain population and it is found that 12 people in the…

A: Given: Number of people (n)=50 Number of people that are over 6 feet tall (x)=12

Q: Security researchers frequently would like to know the probability people pick things for their…

A: Most common 4 digit pins used for mobiles or ATMs 1234 1111 0000 1212 7777 1004 2000…

Q: use the output below (equal variances not assumed) to determine if there is a significant difference…

A: The claim of the hypothesis test is that there is a significant difference in writing scores between…

Q: In the population, the mean SAT score is 1000. Would you be more likely (or equally likely) to get a…

A: Given that the population mean is 1,000 and the samples sizes selected are 10 and 30.

Q: What z-score forms the boundary between the highest 20% and

A: Let us define x as the value that separates highest 20% and the rest of the scores. That is,…

Q: DESCRIPTIVE STATISTICS: The scores of a test for an engincering class of 10 students is shown here.…

A: As per company guidelines I solved exactly three subparts of the question ..thank you

Q: Suppose that the mean weight of a particular type of ripe tomato is 155 g, and the variance of the…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: The highest score in a distribution is 74 and the lowest score is 51. What is the range?

A: We have given thatminimum value = 51maximum value = 74

Q: You work for a consumer watchdog publication and are testing the advertising claims of a tire…

A: Given life spans are: 48,989   42,327   28,497    38,566    33,197    40,419   41,497…

Q: Part a) Assuming a population standard deviation gross earnings of 0.48 million dollars, obtain a…

A: Standard deviations σ=0.48, level of significance ɑ=0.01, n=30, sample mean X̄=2.35

Q: A sample of 2600 people were asked if they felt "good" about the economy. A 95% CI for the…

A: Lower limit = 0.54 Upper limit = 0.62