air pollution control specialists in southern california monitor the amount of ozone, carbon dioxide, and nitrogen dioxide in the air on an hourly basis. the hourly time series dataexhibit seasonality, with the levels of pollutants showing patterns that vary over the hoursin the day. on july 15, 16, and 17, the following levels of nitrogen dioxide were observedfor the 12 hours from 6:00 a.m. to 6:00 p.m.July 15: 25 28 35 50 60 60 40 35 30 25 25 20July 16: 28 30 35 48 60 65 50 40 35 25 20 20July 17: 35 42 45 70 72 75 60 45 40 25 25 25a. construct a time series plot. What type of pattern exists in the data?b. Use the following dummy variables to develop an estimated regression equation toaccount for the seasonal effects in the data

Section H: Hyla chrysoscelis is a type of gray tree frog with a distinct mating call. Frogs are cold-blooded animals, and their physiology is affected by variations in temperature. Researchers wanted to know if the mating song of Hyla chrysoscelis is affected by the temperature of its natural habitat. They observed the mating song frequency (y in notes/sec) and the habitat (x in °Celsius) of 20 Hyla chrysoscelis in the wild. We aim to express the relationship between and y by using the simple linear regression model Yį = ßo + ß₁ x; + Eį. Table H.1 Coefficients Standardized Unstandardized Coefficients Coefficients 95.0% Confidence Interval for B Lower Bound B Std. Error Beta Sig. Upper Bound Model 1 (Constant) -6.190 -23.508 11.128 Temperature 2.331 1.602 3.059 a. Dependent Variable: Frequency Table H.2 Model Summary Model R Square R .846ª 1 .715 a. Predictors: (Constant), Temperature b. Dependent Variable: Frequency Adjusted R Square 8.243 .347 .699 Std. Error of the Estimate 2.82159…

The numbers of polio cases in the world are shown in the table for various years. Year Number of Polio Cases (thousands) 1988 1992 1996 2000 2005 2007 350 138 32 6 3.2 1.3 Let f(t) be the number of polio cases (in thousands) t years after 1980. Copy the data to Desmos to draw a scatterplot of the data. Make sure to adjust the years so they represent years after 1980. a) Is it better to model the data with a linear or with an exponential model? Select an answer b) Use regression in Desmos to find an appropriate model for f. Make sure to check Log mode in the parameter window in Desmos if you are fitting an exponential model. f(t) places. Round the coefficients to 4 decimal Hint: Use the variable t from the drop down menu when entering the equation. Do not just type in t. c) Predict the number of polio cases in 2019. d) Find the approximate half-life of the number of polio cases. Round the answer to one decimal place. years

The creator of a new online multiplayer survival game has been tracking the monthly downloads of the game. The following table shows the monthly downloads (in thousands) for each month of the current and previous year. Click on the datafile logo to reference the data.   The datafile logo.   Month Downloads Month Downloads (previous year) (thousands) (current year) (thousands) February 33.0 January 31.0 March 34.0 February 32.0 April 34.0 March 33.0 May 31.0 April 34.0 June 32.0 May 33.0 July 33.0 June 32.0 August 35.0 July 35.0 September 36.0 August 33.0 October 37.0 September 33.0 November 34.0 October 31.0 December 35.0     a. Compute the mean, median, and mode for number of downloads in the previous year. Mean (to 3  decimals)   thousand Median (to 2 decimal)   thousand Mode (to 2 decimal)   thousand b. Compute the mean, median, and mode for number of downloads in the current year. Mean (to  3 decimals)   thousand Median (to 2…