The new management team of a company with 200 staff members wants to know the efficiency of its staff members. They randomly select 50 staff members and observe them for a period of time and note that their daily average working hour is 7 hours. If previous research in the field of Human Resources show that the standard deviation of the number of hours that people work is half an hour, construct a 95% confidence interval for the average number of hours that the companies staff member work per day. Please include confidence interval formula that you use for your calculations

Q: A professor in the women’s studies program believes that the amount of smoking by women has…

A: Given a professor believes that the amount of smoking by women has increased in recent years. 2…

Q: Medical researchers are interested in determining the relative effectiveness of two drug treatments…

A: Hi! Thank you for the question. As per the honor code, we are allowed to answer three sub-parts at a…

Q: A super department store chain has just ordered and received 1000, 48-inch ceiling fans. The store…

A: From the given information, a supermarket department store has 1,000 ceiling fans. That is, the…

Q: until remission of 162 days with a standard deviation of 7 days. Assume that the populations of…

A: Given that  n1=13x1=176s1=5n2=14x2=162s2=7 Pooled standard deviationsp=n1-1s12+n2-1s22n1+n2-2…

Q: A coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of 7.2…

A: Given Information: Mean of coffee per ounce,μ0 = 7.2 ounce If  it dispense more money loses. If it…

Q: An agronomist would like to estimate the average weight of all Indian River County grapefruits. The…

A:

Q: A student received 40 points out of 50 in midterm 1. The mean score of the class in midterm 1 was 30…

A: The student's score went down from midterm 1 to midterm 2. Explanation:Approach to solving the…

Q: Gary has discovered a new painting tool to help him in his work. If he can prove to himself that the…

A: We want to find conclusion

Q: The time married men with children spend on child care averages 6.1 hours per week (Time, March 12,…

A: The hypotheses can be constructed as: H0: µ = 6.1 H1: µ ≠ 6.1 Sample size (n) = 40 Assume level of…

Q: The mean hours of worked for United Airlines pilots is 46 hours/month based upon a sample of 25…

A: Given: Sample size, n=25 Sample mean, X=46 hours Sample standard deviation, s=3 hours The level of…

Q: A clinical trial is being conducted in order to determine the efficacy of a new drug that will be…

A: Given: Margin of error E=5 Standard deviation σ1=σ2=15 Confidence level is 95% Significance level is…

Q: Researchers are interested in the effect of pet companionship on depression in elderly adults. They…

A: According to the given information in this questionWe need to identify the correct option

Q: Student A and B are enrolled in two separate math classes. The scores of the two classes have…

A: From the provided information, The z score of student A = 1.90 The z score of student B = 2.80

Q: A regulation lacrosse ball should weigh 154 grams. A company produces lacrosse balls for the PLL.…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: researcher would like to evaluate the effect of a new reading program for second-grade students. For…

A:

Q: researcher was interested in the mean corn yeild for farmers in Illinois. She took an SRS of 28…

A: Given that  Margin of error =E =3.5 Population standard deviation =13.25 95% confidence level.

Q: he density netion of the cont variable X, the total number of hours, in units of 100 hours, that a…

A: We want to find average and variance.

Q: to test if these results says that the average of daily calcium take from low income adults is below…

A: Given : μ0 = 800 Sample Mean (Xˉ)(\bar X) = 755.3 Sample Standard Deviation (s)(s) = 239.3 Here…

Q: A certain counselor wants to compare mean IQ scores for two different social groups. A random sample…

A:

Q: Medical researchers interested in determining the relative effectiveness of two different drug…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

Q: The population average score on a personality measure is ? = 300 and the population standard…

A: The population average score on a personality measure is 300 and the population standard deviation…

Q: A certain counselor wants to compare mean IQ scores for two different social groups. A random sample…

A:

Q: Researchers are interested in the effect of pet companionship on depression in elderly adults. They…

A: Number of sample =25Significance level =0.05

Q: Medical researchers are interested in determining the relative effectiveness of two drug treatments…

A: From the provided information,

Q: depression scores before and after spending a month with a dog (a higher score indicates a higher…

A: Sample size n =25Difference of means is -1 and standard deviation is 2

Q: Researchers are interested in the effect of pet companionship on depression in elderly adults. They…

A: Sample size (n) = 225Sample mean (x̅) = --1Standard deviations (s) = 2Confidence level (c) = 95% =…

Q: A data set includes 103 body temperature of healthy adult humans having a mean of 98.1F and standard…

A: It is given that sample mean is 98.1 and the standard deviation is 0.56.

Q: A score from a usability test could be considered an outlier if it is more than 2 standard…

A: An outlier decided on the basic of lower and upper fences of respective data. Any value out of these…

Q: A cognitive psychologist believes that a particular drug improves short term memory. And experiment…

A: 1] No. of words =8,9,10,6,8,7,9,7,7 2] level of significance  α=0.05 3] n=9

Q: In the current pandemic situation, customers are making greater use of grocery home delivery…

A: 1) The population of the provided study is all the customers in Fairfax county which are having…