A bank found that in recent years, the average monthly charge on its credit card was $1,350. With an improving economy, they suspect that this amount has increased. A sample of 45 customers resulted in an average monthly charge of $1,376.77 with a standard deviation of $182.81. Do these data provide statistical evidence that the average monthly charge has increased? Formulate the appropriate hypothesis test and draw a conclusion. Use a level of significance of 0.05. Is there sufficient evidence at the 0.05 level of significance that the average monthly charge has increased? Determine the null hypothesis, H, and the alternative hypothesis, H,. Ho H, (Type whole numbers.)

Q: Twelve second-year medical students at a local hospital measured the systolic blood pressure of the…

A:

Q: An executive believes that no more than 80% of the company’s employees take all of their vacation…

A:

Q: A clinical trial is planned yo compare an experimental medication to lower blood pressure to a…

A: In this scenario, it is appropriate to use paired t test. Hypotheses and level of significance: The…

Q: The average wait time to get seated at a popular restaurant is 7 minutes. Is the mean wait time…

A:

Q: What does the F-ratio tell us in between-subjects ANOVA results

A: ANOVA: It stands for Analysis of Variance. It is a statistical technique used to compare more than…

Q: Six salesperson, who work for a car dealership, participated in a training seminar: "How to be a…

A:

Q: To determine whether the test statistic of ANOVA is statistically significant, it can be compared to…

A: ANOVA: Analysis of Variance is known as ANOVA, it is a hypothesis testing to compare the means of a…

Q: What happens to the proportion of intervals that include the population proportion as the sample…

A: The formula for the confidence interval of population proportion can be written as: Here n is the…

Q: At a local university, English instructors are supposed to grade essays in a class so that the…

A: Given,   Sample size = 22 Sample mean = 79.1 Sample standard deviation = 6.5

Q: Find the minimum number sample size neeeded to be ninety seven percent confident that the true mean…

A: Given informationstandard deviation (σ)=7.3 ouncesMargin of Error=2.3α=0.03Zα/2=0.032=2.17   (from t…

Q: For the following conjecture, state the null and alternative hypotheses. The average resting pulse…

A: Given that: Population average=μ=70

Q: An advertising agency is studying social media campaigns and how they impact website traffic. The…

A: The advertising agency states the average increase in website traffic after social media campaign is…

Q: 1. A local news report claims that 40% of the vehicles on the freeways are vans or SUV's. You go to…

A: Given,   The sample proportion is,

Q: What is the relationship between the critical value with the level of significance (alpha)?

A: here use basic of significance level and critical value

Q: Six salesperson, who work for a car dealership, participated in a training seminar: "How to be a…

A:

Q: he partial credibility premium is calculated as 706 for 400 observations with mean loss of 00. It is…

A:

Q: any impact on people's behavior. Before the new tax, convenience stores in the city sold an average…

A: Given average of μ = 410, sugar filled beverages per day with (Sigma) = 60. sample of n = 9 days…

Q: Think about doing an Independent-Measures ANOVA, Step 3.  If the ANOVA Source table looks as…

A: Solution

Q: Suppose IQ scores were obtained for 20 randomly selected sets of siblings. The 20 pairs of…

A:

Q: Explain the Process of Computing the p-value using the F-statistic?

A:

Q: What is the p value associated with this test statistic

A: Let μ denote the proportion of people in the population of USA adults, who believe that, raising the…

Q: According to a study, the proportion of individuals in which cover their mouths when sneezing is…

A: Z score for single proportion test is use for testing the proportion

Q: test statistic x2 & pvalue

A:

Q: Explain about estimating effects size: point estimates and confidence intervals.

A: The formula for Cohen's d value is obtained below: According to Cohen’s standards, an effect size…

Q: Use t-test to test the claim about the population mean at the given level of significance and using…

A: Null hypothesis:µ=50.Alternative hypothesis:µ<50.This is a left tailed test.Since the population…

Q: what doos Ox indicate about the results of a pre - assessment?

A: It is given that What does ox indicate about the result of pre-assessment?

Q: Paired t-test 9. A doctor wants to test if a new “love potion" increases the number of dates over…

A:

Q: What are the Class 1 error rate and the Class 0 error rate on the test data?

A: Class 1 error rate are false positives on test data Class 0 error rate are false negative on test…

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.