A study was conducted to determine if a new weight loss pill is effective. The null hypothesis is that the mean weight loss is equal to zero, and the alternative hypothesis is that the mean weight loss is greater than zero. A sample of 100 individuals were given the pill and the mean weight loss was found to be 4 pounds with a standard deviation of 2 pounds. What is the z-score and p-value for this hypothesis test?

Q: An arrival reports that blue eyed people earn less than brown people, with these numbers: average…

A: Given data: The average salary of blue-eyed people is: A=$35,000. The average salary of brown-eyed…

Q: A professors exam scores have been consistent for years and normally distributed. The whole data…

A: From the provided information, Sample size (n) = 80 Population standard deviation (σ) = 1.75 Sample…

Q: A researcher wishes to determine if vitamin E supplements could increase cognitive ability among…

A: Here, M1=27, sd1=6.9 and M2=24, sd2=6.2 n1=n2=90=n Pooled sd, sp=sqrt((6.92*89+6.22*89)/(90+90-2))…

Q: A statistics professor takes a random sample of 25 students who have taken a special statistics…

A: From the provided information, Sample size (n) = 25 Sample average (x̄) = 86 Sample standard…

Q: Previous research has shown that the mean number of ballpoint pens Americans use per year is 4.3…

A:

Q: A new apparatus has been devised to replace the needle in administering vaccines. The apparatus,…

A: variance in the amount of serum injected to a given person must not be greater than .06 So,

Q: Tesla tires claim that its high-class tire averages at least 60,000 miles before replacement. It is…

A:

Q: A scientific supply company has developed a new breed of lab rat, which it claims weighs the same as…

A: Given that, A scientific supply company has developed a new breed of lab rat, which it claims weighs…

Q: Your research group has been hired to determine if college men and women drink different amounts of…

A: We have to calculates the z-score.

Q: If you receive a p-value of 0.233 when performing a statistical test. Using the normal alpha level,…

A: From the provided information, The p value is 0.233.

Q: You are conducting a hypothesis test on the body weights of male fraternity members. The null…

A: From given data we have : μ=200,x=203,n=64,σ=20

Q: The correlation between a response and an explanatory variable was calculated as part of a simple…

A: From the given data:   Null and Alternate Hypothesis:   H0: ρ=0HA: ρ≠0

Q: Do sit down restaurant franchises and fast food franchises differ significantly in stock price?…

A: It is needed to check whether sit down restaurant franchises and fast food franchises differ…

Q: It is known that the scores on a standardized reading test are normally distributed with a mean of…

A: State the hypotheses.

Q: we are interested in how much time young adults spend on social media. in one statistical study . we…

A: Given: In the statistical study, the researcher wants to know how much time young adults spend on…

Q: searchers conducted an experiment to test the effects of alcohol. Errors were recorded in a test of…

A: Given that  Sample sizes n1=22 ,n2=22 Standard deviation s1=2.40 , s2=0.88

Q: A researcher claims that the mean yearly consumption of soft drinks exceeds 50 gallons. In a random…

A: From the provided information, Sample size (n) = 49 Sample mean (x̄) = 56.3 Population standard…

Q: A researcher wants to test to see if a population mean is different from 6. Based on a sample of…

A:

Q: State the statistical hypotheses against a population with a mean of 90 for a one-tailed test where…

A: Given: μ=90 The hypotheses for testing the population mean is given bellow: Null hypothesis: H0:…

Q: determine if the typical weight loss is different than 10 pounds.

A: Given that  A new weight-watching company advertises that those who join will lose, on the average,…

Q: Citrus rental is a popular car rental agency that has a history of having too few cars available, so…

A: From the given information we conduct t test for one mean

Q: You are doing a right-tailed hypothesis test for the mean and have to approximate the standard…

A: It is given that the test is right-tailed. Level of significance is 0.01 Degrees of freedom is 39-1=…

Q: A company wants to test a new medicine for its effectiveness in treating ulcers. They take an srs of…

A: Given data: x1¯=6.8s1=1.2n1=500x2¯=8.2s2=1.6n2=500

Q: An RA at the University of Baltimore has concluded that the difference between the mean GPA scores…

A: Type 1 error : - We we reject the true Null Hypothesis Type 2 error : - When we accept the false…

Q: A suggestion is made that the proportion of people who have food allergies and/or sensitivities is…

A:

Q: Circulating levels of estrogen were measured in a sample of 25 postmenopausal women following…

A: The sample size is 25.

Q: The average American consumes 93 liters of alcohol per year. Does the average college student…

A:

Q: An agriculture company wants to know if a new type of fertilizer has improved crop yield or not.…

A: Given data : sample size, n =17 sample mean, x̄ = 30.4 sample standard…

Q: Jamie, a bowler, claims that her bowling score is less than 168 points, on average. Several of her…

A: Given a hypothesis test to check the mean bowling score of Jamie is less than 168.Ho : µ ≥ 168Ha : µ…

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

A: t-test: If the given sample size is less than or equal to 30 and sample standard deviation is given.…

Q: An educator has developed a program to improve math scores on the Texas STAAR test. The average…

A:

Q: Researchers conducted an experiment to test the effects of alcohol. Errors were recorded in a test…

A: From the provided information,

Q: Scores on a certain "IQ" test for 18-25 year olds are normally distributed. A researcher believes…

A:

Q: Researchers conducted an experiment to test the effects of alcohol. Errors were recorded in a test…

A: Solution: Given information    n1=22  Sample size of people in treatment group n2=22  Sample size of…

Q: It was reported that last year the average price of gallons of gasoline in a city X was $3.15. This…

A: Ho:u=3.15 vs H1: u<3.15 xbar=3.10, n=50, σ=0.15

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A: The objective of this question is to test the manufacturer's claim that the tires last at least…

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A: Given information Population mean µ = 50000 Sample size n = 21 Sample mean x̅ = 46500 Standard…

Q: An automobile manufacturer claims that their van has a 50.5 miles/gallon (MPG) rating. An…

A: In given question,We know that ,for population : an automobile manufacturer claims that their van…

Q: A sample of 100 observations from a normal population has a mean of 50 and a standard deviation of…

A: The given information is:The sample number of observations from a Normal population are The sample…

Q: Data were collected from 400 patients in the US about their estrogen level.  Out of the 400, 35…

A: Test whether the population proportion of patients with abnormal estrogen levels is equal to 0.08 or…

Q: You are a researcher verifying the claim that the average adult consumes 1.7 cups of coffee per day.…

A: From the provided information, Sample size (n) = 30 Sample mean (x̄) = 1.85 Population standard…

Q: Scores on a certain "IQ" test for 18-25 year olds are normally distributed. A researcher believes…

A: Solution:- from given information Null hypothesis H0:μ=110Alternate hypothesis Ha:μ<110mean…

Q: A quiz related to digital knowledge was conducted. The quiz had 10 questions and covered topics such…

A: Given Information: Sample size n=50 Sample mean x¯=4.1 Sample standard deviation s=2.6 We want to…

Q: For this study, we should use Select an answer z-test for a population proportion t-test for a…

A: The average salary in city is $43,200. Claim states that, average salary for single person is more…

Q: What Values of x the null hypothesis would be rejected. aining intensively for six months, John…

A: We can see that it is a left-tailed test.The calculations for the left critical value is given as…

Q: For this study, we should use Select an answer t-test for the difference between two dependent…

A: As per our guidelines, we are allowed to answer three sub-parts only The provided sample means are…