In a hypothesis test, the null hypothesis states that the population proportion of individuals who support a certain political candidate is equal to 0.6. A sample of size 400 is taken and 175 individuals support the candidate. What is the Z-score for this hypothesis test?

Q: A study found that 80% of teenagers use social media on a regular basis. John wants to investigate…

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Q: A statistician selects a sample of 20 participants and makes the decision to retain the null…

A: Given : Sample of 20 participants led to retain the null hypothesis Sample 100 participants led to…

Q: An environmentalist wishes to conduct a hypothesis test on the percentage of cars driven in the city…

A: Sample size (n) = 173Population proportion (p) = 0.08Thus,

Q: researcher selects a sample and administers treatment for anxiety to the individuals in the sample.…

A: We he to find correct answer for  the null hypothesis (H0) put forth about the treatment...

Q: A study is conducted to compare two brands of paint. A consumer testing service found the following…

A: Claim:  The population mean coverage of brand A is significantly different from the population mean…

Q: A recent survey asked 1200 randomly selected U.S. adults if they believe that the U.S. federal…

A: Let the proportion of women (p1) and men (p2) who believe that the U.S. federal government is not…

Q: Many elementary school students in a school district currently have ear infections.  A random sample…

A: Solution: Let p1 be the proportion of students who have ear infections at one school and p2 be the…

Q: A quality engineer is asked to determine whether less than 2% of all flasks received by its company…

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Q: Illustrate the null hypothesis for a correlated t test?

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Q: An environmentalist wishes to conduct a hypothesis test on the percentage of cars driven in the city…

A: Sample size(n)=143 Population proportion(P)=0.04 q=1-p q=1-0.04=0.96

Q: A political scientist claims that 38% of first-year college students characterize themselves as…

A: Hypothesis  Ho: p=0.38 vs H1: p≠0.38  X=225, n=500  p^=x/n

Q: The graduation rate from high school in a certain county is 76%. A school in that county wants to…

A: Given that  Sample size n =300 Favorable cases x =223 Sample proportion p^=x/n  =223/300 =0.7433

Q: A recent drug survey showed an increase in the use of drugs and alcohol among local high school…

A: Given, n1 = 100, n2 = 100 p1 = 67 and p2 = 61

Q: In a National Institute on Alcohol Abuse and Alcoholism survey, 33% of American adults said that…

A: Given: n= 2300 ,x= 805 p= 0.33 ,significance level(∝)= 95.0 p̂= 805 / 2300 =define hypothesis;-

Q: A hypothesis test is conducted to determine whether the percentage of US adults that think marijuana…

A: Given,n=400x=144p^=xnp^=144400=0.36

Q: A teacher selects a random sample of 56 students from her large high school. For each student, she…

A: We want to tell you hypothesis

Q: Find the P-value of z-score (3.55) if doing a two-tail hypothesis test.

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Q: A recent drug survey showed an increase in the use of drugs and alcohol among local high school…

A: Local: Sample size n1=100 Number of successes x1=65 National: Sample size n2=100 Number of successes…

Q: If you use a 0.05 level of significance in a​ two-tail hypothesis​ test, what decision will you make…

A: Given  ZSTAT=-1.52, ɑ=0.05 Two tailed hypothesis

Q: As a result of dog breeding for certain physical traits, many dog breeds have changed in the last…

A: Option d) is correct. Test for a difference in two population means.

Q: USA Today article claims that the proportion of people who believe global warming is a serious issue…

A: Given that  Sample size n =20 Favorable cases x =12 Sample proportion p^=x/n  =12/20 =0.60

Q: According to the most recent General Social Survey, 70% of adults watch TV nightly. A researcher…

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Q: A researcher is wondering whether the drinking habits of adults in a certain region of a country are…

A: Here n = 150 , p = 0.26. In order to use normal approximation, sample must satisfy following…

Q: A state's Division of Motor Vehicles (DMV) claims that 60% of all teens pass their driving test on…

A: The question is about confidence interval.Given : Null and alternative hypotheses :Confidence…

Q: A recent drug survey showed an increase in the use of drugs and alcohol among local high school…

A:

Q: Consider an experiment for patients who underwent CPR for a heart attack and then was sent to the…

A: Let us consider two samples taken randomly The proportion of the two samples is compared.  Since the…

Q: A polling company conducted a hypothesis test to see if people are happy with the government, and…

A: Given : A polling company conducted a hypothesis test to see if people are happy with the…

Q: An environmentalist wishes to conduct a hypothesis test on the percentage of cars driven in the city…

A: sample size(n)=173 Population proportion(P)=0.08 q=1-p q=1-0.08=0.92

Q: A researcher selects a sample and administers a treatment for anxiety to the individuals in the…

A: Given that selects a sample and administers a treatment for anxiety to the individuals in the…

Q: Find the P-value for the indicated hypothesis test. In a sample of 47 adults selected randomly from…

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