A doctor is examining his patient records in hopes to determine the true proportion of his patients who are overweight or obese. After examining 200 files, he finds that 55% of these patients are medically classified as being overweight or obese. Suppose that when he started his practice 5 years ago, the proportion of his patients who where overweight or obese was 64% (the current national percentage). Does this doctor have sufficient evidence to claim that the proportion of his patients with this classification has decreased over the years with alpha = 0.05?

Q: A sample of 60 stocks traded on the NYSE that day showed that 23 went up. You are conducting a…

A: It is claimed that, the proportion of stocks that went up is significantly more than 0.3.…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: From the provided information, Sample size (n) = 58 From which 28 went up. Level of significance (α)…

Q: Ten years ago, 35% of a brokerage firm’s clients only had a single account, 25% had 2 accounts, and…

A: Solution: Given information:  n= 300 Sample size of clients k= 3 Categories  P1= 0.35 Probability of…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Given : Sample size : n=76 Number of successes : x=21 We are conducting a study if the proportion of…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A:

Q: The following is based on information from The Wolf in the Southwest: The Making of an Endangered…

A: Conclusion: At the 0.01 level of significance, we reject the null hypothesis and conclude that the…

Q: The following is based on information from The Wolf in the Southwest: The Making of an Endangered…

A: Part a]: Provided information is; Sample size(n) =37 sample proportion(p^) =1137 Level of…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Given that,possible chances (x)=15sample size(n)=60success rate ( p )= x/n = 0.25success…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Given data number of success , x= 19 sample size, n =75 population proportion,p= 0.3

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: From the provided information,

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: The z test are used to compare the proportion of sample and population. The sample proportion is…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: State the hypotheses. That is, there is no evidence that the true proportion of stocks that went up…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: From the provided information, The hypotheses can be constructed as: H0: p = 0.30 H1: p > 0.30…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: From the provided information, Sample size (n) = 71 Out of which 24 went up. Level of significance…

Q: As such, the final conclusion is that... There is sufficient evidence to warrant rejection of the…

A: For the given situation, Null Hypothesis: H0: The proportion of stocks that went up is not…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: It is required to test  if the proportion of stocks that went is greater than 0.3 or not. So, the…

Q: barometer of the overall stock market. On January 31, 2006, 9 of the 30 stocks making up the DJIA…

A:

Q: Sleep apnea is a condition in which the sufferers stop breathing momentarily while they are asleep.…

A: Claim : the percentage of commercial truck drivers who suffer from sleep apnea is not 4.1%

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Here α=0.002 n=54 x=19

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Given Null Hypothesis Ho : p = 0.30Alternate Hypothesis Ha : p < 0.30Sample size n = 78Number of…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: From the provided information, Population proportion (p) = 0.30 The hypotheses can be constructed…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Given x=29 n=80

Q: A hospital has studied its patient history and had concluded that 2% of patients that have been…

A: Given: Proportion of patients infected with staff bacteria = 2100=0.02

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Solution: State the hypotheses Null hypothesis: That is, the proportion of stocks that went up is…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Givensample size(n)=64x=12significance level(α)=0.02sample proportion(p^)=xn=1264=0.1875

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: The test statistic for this sample is, Thus, the test statistic is 1.022.

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A:

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A:

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Solution: Given information: n= 51 Sample size of stocks  x= 8 stocks went up  p^=xn=851=0.1569…

Q: a. Choose the appropriate alternative hypothesis for the test. O At least one of the p; (i= 1, 2, 3)…

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

Q: A hospital has studied its patient history and had concluded that 2% of patients that have been…

A: Given: 2% of patients have been admitted with staff bacteria.

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: From the provided information, Sample size (n) = 78 Out of which 26 went up. Level of significance…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A:

Q: If we construct a 95% confidence interval estimate for the true proportion of all Minnesota school…

A: here given, n = 200 sample proportion  =20200 = 0.1 here for z-critical use excel command…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Suppose that in a survey of 1,000 U.S. residents, 721 residents believed that the amount of violent…

A: From the provided information, Number of residents = 1000 721 residents believed that the amount of…

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Denote p as the true population proportion of stocks that went up.

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Given, p = 0.3 x = 12 n = 50 α = 0.01

Q: Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good…

A: Given information- Sample size, n = 80 Out of 80 sample 22 went up. Therefore, x = 22 Significance…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.