Can you answer with proper detailed explanation

Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 23 minutes and a standard deviation of 5 minutes, while method B has a mean of 27 minutes and a standard deviation of 2.5 minutes. (a) Which procedure is preferred if the procedure must be completed within 24 minutes? O Method A O Method B O Either Method (b) Which procedure is preferred if the procedure must be completed within 34.5 minutes? O Method A O Method B O Either Method (c) Which procedure is preferred if the procedure must be completed within 31 minutes? O Method A O Method B O Either Method

20152010 Number of people asked 250 400 Number of people who prefer real estate 130 180 The analyst claims that there is a decreasing trend for every new year for investing the money to real estate. That means the ratio of people who invest their money to "real estate" in 2015 is less than that of in 2010. (H;: P2010 > P2015) Calculate test statistics.

locations for its new stores. The management of the chain wanted to know whether a linear relationship exists between weekly take-home pay (x) and weekly food expenditures (y). A random sample of eight households produced the data shown in the following table Household 1 A supermarket chain performed a survey to help determine desirable 2 4 5 6 7 8 550 450 560 340 510 710 470 660 170 100 160 80 120 190 140 140 y al Find the least square regression line. b/ Perform the test Ho: B1 = 0, HA: B1 # 0 (using a = 0.05) to determine whether there is enough evidence to infer that a linear relationship exists between weekly take-home pay (x) and weekly food expenditures (y). %3D

A community college wants to analyze the age and GPA of its students. Here is the data:

Age

18

40

25

38

44

19

51

28

31

21

24

GPA

2.9

3.3

2.0

3.9

3.7

2.7

3.9

3.5

1.9

2.9

3.4

Can we say that there is a significant relationship between these variables? (Use = .05)

Type of Test:

Null Hypothesis:

Alternate Hypothesis:

SE:

Test Statistic:

P-value:

Decision:

Sentence:

Analysis of several plant-food preparations for potassium ion yielded the following data: Sample Percent K* 1 6.02, 6.04, 5.88, 6.06, 5.82 2 7.48, 7.47, 7.29 3 4 3.90, 3.96, 4.16, 3.96 4.48, 4.65, 4.68, 4.42 5.29, 5.13, 5.14, 5.28, 5.20 The preparations were randomly drawn from the same population. a. Find the mean and standard deviation s for each sample. b. Obtain the pooled value spooled- c. Why is spooled a better estimate of s than the standard deviation from any one

Escobar performed a study to validate a translated version of the Western Ontario and McMaster University index (WOMAC) questionnaire used with Spanish-speaking patient s with hip or knee osteoarthritis. For the 76 women classified with sever hip pain. The WOMAC mean function score was 70.7 with standard deviation of 14.6, we wish to know if we may conclude that the mean function score for a population of similar women subjects with sever hip pain is less than 75. Let a =0.01

In Exercises, hypothesis tests are proposed. For each hypothesis test,

a.identify the variable.

b.identify the two populations.

c.identify the pairs.

d.identify the paired-difference variable.

e.determine the null and alternative hypotheses.

f.classify the hypothesis test as two tailed, left tailed, or right tailed.

TV Viewing. The A. C. Nielsen Company collects data on the TV viewing habits of Americans and publishes the information in Nielsen Report on Television. Suppose that you want to use a paired sample to decide whether the mean viewing times of married men and married women differ.

Emoticons The website www.gamefaqs.com asked, as

their question of the day to which visitors to the site were

invited to respond, "Do you ever use emoticons when you

type online?" Of the 87,262 respondents, 27% said that

they did not use emoticons. ;-(

a) What kind of sample was this?

b) How much confidence would you place in using

27% as an estimate of the fraction of people who use

emoticons?

You have collected data on sales of leggings in each of the four quarters (Q1, Q2, Q3 and Q4) of 2019 and 2020. The data are given in the table below. Q1 Q2 Q3 Q4 leggings sold (millions) in 2019 | 20 leggings sold (millions) in 2020 20 45 60 22 20 40 65 You are asked to find out whether the data from 2019 can be used as a model for legging sales in 2020. To do so, you are asked to test the hypothesis HO: the 2020 data fits the expected model, at 5% significance. (a) What is the expected value (of leggings sold, in millions) for Q2 of 2020? Give your answer as a decimal written to two decimal places: (b) What is the Pearson Chi-squared test statistic? Give your answer as a decimal written to two decimal places: (C) How many degrees of freedom are there?

Scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed with =111=111 and =15=15.

(a) What proportion of children aged 13 to 15 years old have scores on this test above 93 ? (NOTE: Please enter your answer in decimal form. For example, 45.23% should be entered as 0.4523.)

(b) Enter the score which marks the lowest 30 percent of the distribution.

(c) Enter the score which marks the highest 10 percent of the distribution.

Scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed with =96 and =21.

(a) What proportion of children aged 13 to 15 years old have scores on this test above 86 ? (NOTE: Please enter your answer in decimal form. For example, 45.23% should be entered as 0.4523.)

Answer:

(b) Enter the score which marks the lowest 30 percent of the distribution.

Answer:

(c) Enter the score which marks the highest 15 percent of the distribution.

Answer: