A pharmaceutical company claims that the employees' salary average = 1047 dollars. We want to test that the mean is lower than the company's claim. We are using a sample of 49 with an average salary of 1320 dollars. Then the test statistics %3D is? The standard deviation is found to be 8.3 dollars.

Q: sample of 36 students to answer the question, “How anxious do you feel when you know you have to do…

A: Given that  Sample size (n) =36 Sample mean (x¯) = 58 Sample Standard deviation (s) = 30 Confidence…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Given:  This lake is famous for cutthroat trout. A friend tells you that the average length of trout…

Q: Raul received a score of 73 on a history test for which the class mean was 70 with a standard…

A: Here we need to find the z score and for that, we have to use the formula z = Value-meanStandard…

Q: The class mean for the exam was 82 with a standard deviation of 6.  There are 37 students in the…

A: We have given that, Mean = 82 , standard deviation σ = 6  sample size n = 37   Standard error of the…

Q: A state administered standardized reading is given to eighth grade students. The scores for all…

A: Mean(μ)=517 Standard deviation(σ)=63

Q: Dr. Samwell Tarly wants to estimate the number of books checked out of the library in the past year.…

A: It is given that the mean is 10,000 and the standard deviation is 10.

Q: The weights of men in their 30s are normally distributed with a mean of 190 pounds and a standard…

A: From the provided information, Population mean (µ) = 190 pounds Population standard deviation (σ) =…

Q: Management at a video game store wants to gain a better understanding of their customers. In order…

A:

Q: On a national achievement test score was 850 with a standard deviation of 100. What proportion of…

A:

Q: Social scientists have designed a “happiness survey” that attempts to measures how happy people feel…

A: As per guidelines we will solve first question only, please repost other questions for more answers.…

Q: 11. MENSA, the high IQ society, only accepts membership into their organization if an applicant's IQ…

A: Given Data Population Mean,μ = 100.0 Population Standard Deviation,σ = 15.0

Q: samples of n = 100 from

A:

Q: Kelsey Matthau is an advisor for a high school. The high school offers a class for students…

A: The Given hypothesis test for the difference between two means of independent samples is…

Q: The scores on a standardized test are approximately normal with a mean of 83 and a standard…

A: Let T be minimum score needed to be in top 8%

Q: Almost all medical schools require applicants to take the Medical College Admission Test (MCAT).  To…

A: It is given that the mean is 25 and the standard deviation is 6.5.

Q: The honors program at Brads University only except students with an entrance score exam over 400.…

A:

Q: George got a 75 on a math test. The reliability of the math test was .85 and the standard deviation…

A: Confidence Interval: A confidence interval, refers to the probability that a population parameter…

Q: Look at your height, either on your Driver's License or ID card or actually measured. Calculate the…

A:

Q: on a national achievement test score was 850 with a standard deviation of 100. what proportion of…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: score is 115 with a standard deviation of 12. If we assume the exam scores for student athletes…

A: Given that  Sample size n =21 Sample mean=115 Population standard deviation =15 NOTE:- According to…

Q: The standard deviation on your last test was 10. The average was a 70. The distribution had a normal…

A: To find out what percentage of the class scored between 60 and 80, we need to utilize the properties…

Q: A commonly used standardized test in psychology research is designed so that the mean score of all…

A: From the provided information, Mean (µ) = 140 Standard deviation (σ) = 20 X~N (140, 20) Here X be a…

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A:

Q: Your instructor wishes to estimate the mean amount of time students spend studying math each…

A: Given that  Margin of error =E =2 Population standard deviation =12.7 95% confidence.

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A: The psychologist wants to estimate the amount of math anxiety that the population of high school…

Q: Do shoppers at the mall spend more money on average the day after Thanksgiving compared to the day…

A: "Since you have posted a question with multiple sub -parts,we will solve first three sub parts for…

Q: I am not familiar using the standard deviation formula for my statistics class

A:

Q: computer company daims that the employees' salary average = 5774 dollars. The standard deviation is…

A: Given data,μ=5774σ=722n=36x=5171test statistic (z)=?

Q: Almost all medical schools require applicants to take the Medical College Admission Test (MCAT).  To…

A: It is given that the mean is 25 and the standard deviation is 6.5.

Q: You are provided with a mean of 28.18 with a standard deviation of 4.33.  What percent of students…

A:

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A:

Q: The average triglyceride level of adult males is 126 milligrams per deciliter. You want to determine…

A: Step 1: From the provided information, Step 2:Hypotheses and test statistic:The hypotheses can be…

Q: you created a survey that measue Depression In you want to test people. the Claim that the mean.…

A: Solution-: Given: x¯=6.7,μ0=6.5,n=145,s=1.5 We test the claim that the mean measurement of…

Q: The use of chemicals is considered to increase the resistance to scratches during a painting…

A:

Q: A test was designed to have a mean of 80 and a standard deviation of 10. A random sample of 20…

A: Computation of test statistic value: The population standard deviation is given, σ = 10. Thus, in…

Q: Beth scored 88 on a nutrition test.  The class mean was 81 and the standard deviation was 3.2.  What…

A: Mean = μ = 81 Standard deviation = s = 3.2 Where, X= 88

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.