Postpartum depression and anxiety (PPD), is a common medical condition affecting mothers and their families after the birth of a baby. The CDC estimated that 17% of women who have recently given birth suffer from PPD. However, this research only reflected self-reported cases. Therefore, one group dedicated to helping women and their families with PPD believes that the true percentage of women who suffer from PPD is much higher. The group conducts a simple random sample of 98 women who had given birth in the last year and discovers that 26 of them report having PPD. Based on this evidence, can the group claim that the true percentage of women who have PPD is greater than 17%? Use a  .02 level of significance.

A journal reported a study examining the possible impact of air pollution on the weight of babies. Researchers found that 9% of 174 babies bon to mothers who were exposed to heavy doses of air pollution in a city were classified as having low birthweight. Only 5% of 2300 babies bom in another hospital in the city whose mothers had not been exposed to air pollution were similarly classified. Does this indicate a possibility that air polution might be linked to a significantly higher proportion of low-weight babies? a) Test an appropriate hypothesis at a = 0.10 and state your conclusion. b) If you concluded there is a difference, estimate that difference with a confidence interval and interpret that interval in context. State the conclusion. Reject Ho. There sufficient evidence at the a = 0.10 level of significance to conclude that the population proportion of low-weight babies born to mothers who were exposed to air pollution is greater than the is population proportion of low-weight…

In a study conducted by the U.S. Department of Health and Human Services, a sample of 546 boys aged 6–11 was weighed, and it was determined that 87 of them were overweight. A sample of 508 girls aged 6–11 was also weighed, and 74 of them were overweight. Can you conclude that the proportion of boys who are overweight differs from the proportion of girls who are overweight? Please show calcul

Imagine you are a statistical consultant and your client, a weightlifting supplement company, is looking to see if their product is effective in increasing muscle mass gained over a training cycle. You randomly sampled 20 female weightlifters and assigned them to take the supplement and 20 to take a placebo. You have both groups run the same controlled training program over 12 weeks and calculated their whole body lean mass difference in pounds from the beginning to the end of the program. Can you infer that the supplement group gained more muscle mass on average than the placebo group? Use a = 0.05 for any hypothesis test. પ્રમ 1) State the research question in one sentence and use the question to determine the parameter we are using to conduct statistical inference. Describe this parameter in one sentence using symbols and a description. manu Aren

A researcher is studying whether average GPA is dependent on whether the students are in a 2-year college, public university, or private university. The researcher should use a 1-way ANOVA for this study.   True or false

Last year, the average math SAT score for students at one school was 475.  The headmaster introduced new teaching methods hoping to improve scores.  This year, the mean SAT score for a sample of students was 481.  Is there statistically significant evidence that the new teaching method is effective?  If the teaching method had no effect, there would be roughly a 3 in 10 chance of seeing such an increase.  Does the result have statistical significance? Why or why not? Does the result have practical significance?

Coughlin et al. (A-9) examined the breast and cervical screening practices of Hispanic and non- Hispanic women in counties that approximate the U.S. southern border region. The study used data from the Behavioral Risk Factor Surveillance System surveys of adults age 18 years or older conducted in 1999 and 2000. The table below reports the number of observations of Hispanic and non-Hispanic women who had received a mammogram in the past 2 years cross-classified with marital status. Marital Status Currently Married Divorced or Separated Widowed Never Married or Living As an Unmarried Couple Hispanic 319 130 88 41 Non-Hispanic 738 329 402 95 (a) We select at random a subject who divorced or separated? ect who ha Total 1057 459 490 136 Total 578 1564 2142 Source: Steven S. Coughlin, Robert J. Uhler, Thomas Richards, and Katherine M. Wilson, "Breast and Cervical Cancer Screening Practices Among Hispanic and Non-Hispanic Women Residing Near the United States-Mexico Border, 1999-2000," Family…

Cat Ownership and Schizophrenia Could owning a cat as a child be related to mental illness later in life? Toxoplasmosis is a disease transmitted primarily through contact with cat feces, and has recently been linked with schizophrenia and other mental illnesses. Also, people infected with Toxoplasmosis tend to like cats more and are 2.5 times more likely to get in a car accident, due to delayed reaction times. The CDC estimates that about 22.5% of Americans are infected with Toxoplasmosis (most have no symptoms), and this prevalence can be as high as 95 % in other parts of the world. A study' randomly selected 262 people registered with the National Alliance for the Mentally III (NAMI), almost all of whom had schizophrenia, and for each person selected, chose two people from families without mental illness who were the same age, sex, and socioeconomic status as the person selected from NAMI. Each participant was asked whether or not they owned a cat as a child. The results showed that…

A certain HMO is attempting to show the benefits of managed care to an insurance company. The HMO believes that certain types of doctors are more cost-effective than others. One theory is that certification level is an important factor in measuring the cost- effectiveness of physicians. To investigate this, the HMO obtained independent random samples of 30 physicians from each of the thre certification levels- Board certified (C); Uncertified, board eligible (E); and Uncertified, board ineligible (1)- and recorded the total per member, per-month charges for each (a total of 90 physicians). Identify the dependent (response) variable for this study. O the HMO the three certifications groups- C, E, and I the 90 physicians the total per-member, per-month charge

If a journal publishes 50 scientific papers per year, each using a significance level of 5%, what is the probability at least one of them encountered a type I error?