What does reject the null and fail to reject the null mean? When is either of these applied?

Q: teacher wanted to determine whether there was a significant difference in the mean daily hours of…

A:

Q: How would a person set up the hypotheses if they wanted to test the claim: the mean temperature of a…

A: Types of errors: Type-I error: The probability of rejecting Null Hypothesis H0, when H0 is true. It…

Q: Frito-Lay produces a 10 ounce family size bag of the regular potato chips and a 9.5 ounce family…

A: The parameter of interest is the the difference of mean weight of regular potato chips and wavy…

Q: Why should you use ANOVA instead of several t tests to evaluate mean differences when an experiment…

A: T-test: The type of test in inferential statistics helps to find whether there is any difference in…

Q: If the P-value is 0.003 and the level of significance , , is 0.05 in a hypothesis test for a mean,…

A: Given,p-value =0.003and  level of significance(α)=0.05

Q: An automobile manufacturer claims that a particular model car averages 24 miles per gallon. A…

A: mu = 24 n = 30

Q: Which of these comparisons between an ANOVA and a t test is correct?   An ANOVA can be used to…

A: ANOVA decides whether three or more populations are statistically different from each other, while…

Q: According to a recent article about individuals who have credit cards, he mean number of cards per…

A:

Q: Do ESL students score lower in English college placement tests than the national average? A…

A: We have to find test used.

Q: How do I interpret the mean of 12.5 and median of 12.5 with no repeating so there is no mode? How…

A: Given that  Mean = 12.5  Median = 12.5

Q: Professor Tom knows that the mean score on the midterm exam from all the years he has been teaching…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: The XYZ company wants to see if interview scores predict job performance scores. So it goes back…

A: The claim is to check whether there is a relationship between employee interview scores and employee…

Q: Classify the hypothesis test as two-tailed, left-tailed, or right-tailed. In 1994, the average…

A: We have to find type of test ..

Q: Suppose you would like to determine if the mean score for the first round of a golf tournament event…

A: Here we have paired data so paired t test will be used.

Q: The Department of Agriculture wants to determine whether the mean yield per acre for a particular…

A: from the given information we find the 95% confidence interval.

Q: What is the criterion for rejecting the null hypothesis for both non-directional and directional…

A: Test for single proportion: In order to test the hypothesis regarding a single proportion, a single…

Q: Even though Asian culture does not necessarily value being thin, the Asian youth is affected by the…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…

Q: A psychologist examined the effect of chronic alcohol abuse on memory. In this study, a standardized…

A: Given: µ=50 σ=6 n=22  X=47 α=0.05

Q: What is the one-sample t-interval for the mean?  Explain in words and symbols.

A: We use t distribution to estimate interval for population mean when the standard deviation of…

Q: According to a recent article about individuals who have credit cards, the mean number of cards per…

A: Given : population mean = 4

Q: According to a report, the mean of monthly cell phone bills was $48.75 three years ago. A researcher…

A: Given :  According to a report , the mean of monthly cell phone bills was $48.75 three years ago . A…

Q: There are three possible alternative hypotheses in a hypothesis test for a population mean. Identify…

A: There are three possible alternative hypotheses. Let µ be the population mean and c be the value to…

Q: How can they tell that this is a two-tailed test?

A: From the given information we find the solution.

Q: . What is the advantage of one-tailed tests over two-tailed tests?  b. What is the disadvantage of…

A: these are the following

Q: What is the test statistic for this hypothesis test?

A: The Department of Agriculture wants to determine whether the mean yield per acre for a particular…

Q: Could listening to rock music raise your blood pressure?To find out, researchers randomly divided 50…

A: Before proceeding with the statistical tests, researchers might need to check on the dependency on…

Q: The mean annual salary of (public) classroom teachers is $55.4 thousand. A hypothesis test is to be…

A: Claim: The mean annual salary of classroom teachers in Ohio is greater than the national mean That…

Q: If the test statistic falls within the rejection region, you reject H0 in favour of Ha true false

A: In this case, we need to identify the given statement is true or not.

Q: Rahim & Maria Sdn Bhd collected a sample of 1000 consumers to try a newly developed frozen fish…

A: It is an important part of statistics . It is widely used .

Q: What is the formula for a two tailed test?

A: In two-tailed test the critical area of a distribution is two-sided.  If the sample being tested…

Q: true or false  If the p-value is 0.13 and the level of significance , αα , is 0.05 in a hypothesis…

A: Given that, P-value = 0.13 Level of significance, α = 0.05

Q: The Department of Agriculture wants to determine whether the mean yield per acre for a particular…

A: The random variable yield per acre for a particular variety of soybeans follows normal distribution.…

Q: . Suppose a researcher has heard that children watch an average of ten hours of TV per day. The…

A:

Q: The Department of Agriculture wants to determine whether the mean yield per acre for a particular…

A: Given Data: x¯=573n=36s=24

Q: The sample data here is the cholesterol levels for 10 men diagnosed with high cholesterol. The first…

A: Result Option 3 is correct. The mean cholesterol level of males who take the medicine is lower than…

Q: Professor Nord stated that the mean score on the final exam from all the years he has been teaching…

A: From the provided information, Professor Nord stated that the mean score on the final exam from all…

Q: A graduate student is interested in how viewing different types of scenes affects working memory.…

A:

Q: A graduate student is interested in how viewing different types of scenes affects working memory.…

A: Given,⇒ 95% confidence interval for the mean difference is:     d± tn-1 , α/2sd     1.4±2.030×0.2667…

Q: can you give me a sample of this one? Test on mean for one sample

A: The test on mean for one sample  The sample size should be less than 30 Then we use t test for one…

Q: The Department of Agriculture wants to determine whether the mean yield per acre for a particular…

A: Given, Hypothesis:  H0 ; μ = 520VsHa: μ ≠ 520 μ = 520x = 573s = 24 n = 36     To find, Test the…

Q: Explain the effect of one- versus two-tailed tests on power?

A:

Q: A psychologist hypothesizes that the children with type-A personality score higher than the children…

A: It is given that the estimated standard error is 1.2, the mean score of type-B is 22.2 and the mean…

Q: Professor Nord stated that the mean score on the final exam from all the years he has been teaching…

A: The mean score on the final exam from all the years he has been teaching is a 79%  His class’s mean…

Q: If the p-value is 0.13 and the level of significance , α , is 0.05 in a hypothesis test for a mean,…

A: Given , p-value is 0.13  α, is 0.05  Here p-value is greater than α therefore we cannot reject null…

Q: You set out to conduct a hypothesis test at the 95% level. Mean yields are distributed Normally. You…

A: Given: μ=520Sample mean, x¯=573Sample sd, s=24Sample size, n=36

Q: In a study to test if the mean score is less than an average of 75, the null hypothesis that the…

A: Type II error: The probability of fail to reject the null hypothesis when the alternative hypothesis…

Q: The average age of managers in a particular industry is over 35 years old, and we wishe to prove…

A: Given : Claim : The average age of managers in a particular industry is over 35 years old.  Null…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.